IDEX Mirror mode based on Formbot / Vivedino Symmetric mode (#13404)

Marlin/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

Marlin/src/feature/runout.h

         if (true
           #if NUM_RUNOUT_SENSORS > 1
             #if ENABLED(DUAL_X_CARRIAGE)
-              && (dual_x_carriage_mode == DXC_DUPLICATION_MODE || dual_x_carriage_mode == DXC_SCALED_DUPLICATION_MODE)
+              && (dual_x_carriage_mode == DXC_DUPLICATION_MODE || dual_x_carriage_mode == DXC_MIRRORED_MODE)
             #elif ENABLED(MULTI_NOZZLE_DUPLICATION)
               && extruder_duplication_enabled
             #endif

Marlin/src/gcode/control/M605.cpp

 #include "../../module/tool_change.h"
 #include "../../module/planner.h"
 
+#define DEBUG_OUT ENABLED(DEBUG_DXC_MODE)
+#include "../../core/debug_out.h"
+
 #if ENABLED(DUAL_X_CARRIAGE)
 
   /**
    * M605: Set dual x-carriage movement mode
    *
-   *    M605    : Restore user specified DEFAULT_DUAL_X_CARRIAGE_MODE
-   *    M605 S0 : Full control mode. The slicer has full control over x-carriage movement
-   *    M605 S1 : Auto-park mode. The inactive head will auto park/unpark without slicer involvement
-   *    M605 S2 [Xnnn] [Rmmm]: Duplication mode. The second extruder will duplicate the first with nnn
-   *                         units x-offset and an optional differential hotend temperature of
-   *                         mmm degrees. E.g., with "M605 S2 X100 R2" the second extruder will duplicate
-   *                         the first with a spacing of 100mm in the x direction and 2 degrees hotter.
-   *    M605 S3 : Enable Scaled Duplication mode.  The second extruder will duplicate the first extruder's
-   *              movement similar to the M605 S2 mode.   However, the second extruder will be producing
-   *              a scaled image of the first extruder.  The initial x-offset and temperature differential are
-   *              set with M605 S2 [Xnnn] [Rmmm] and then followed with a M605 S3 to start the mirrored movement.
+   *   M605 S0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+   *             results as long as it supports dual X-carriages.
+   * 
+   *   M605 S1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so that
+   *             additional slicer support is not required.
+   * 
+   *   M605 S2 X R : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+   *             the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+   *             Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+   *             follow with "M605 S2" to initiate duplicated movement. For example, use "M605 S2 X100 R2" to
+   *             make a copy 100mm to the right with E1 2° hotter than E0.
+   *
+   *   M605 S3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+   *             the movement of the first except the second extruder is reversed in the X axis.
+   *             The temperature differential and initial X offset must be set with "M605 S2 X[offs] R[deg]",
+   *             then followed by "M605 S3" to initiate mirrored movement.
+   *
    *    M605 W  : IDEX What? command.
    *
-   *    Note: the X axis should be homed after changing dual x-carriage mode.
+   *    Note: the X axis should be homed after changing Dual X-carriage mode.
    */
   void GcodeSuite::M605() {
     planner.synchronize();
       const DualXMode previous_mode = dual_x_carriage_mode;
 
       dual_x_carriage_mode = (DualXMode)parser.value_byte();
+      mirrored_duplication_mode = false;
 
-      #if 0
-      scaled_duplication_mode = false;
-
-      if (dual_x_carriage_mode == DXC_SCALED_DUPLICATION_MODE) {
+      if (dual_x_carriage_mode == DXC_MIRRORED_MODE) {
         if (previous_mode != DXC_DUPLICATION_MODE) {
           SERIAL_ECHOLNPGM("Printer must be in DXC_DUPLICATION_MODE prior to ");
-          SERIAL_ECHOLNPGM("specifying DXC_SCALED_DUPLICATION_MODE.");
+          SERIAL_ECHOLNPGM("specifying DXC_MIRRORED_MODE.");
           dual_x_carriage_mode = DEFAULT_DUAL_X_CARRIAGE_MODE;
           return;
         }
-        scaled_duplication_mode = true;
+        mirrored_duplication_mode = true;
         stepper.set_directions();
         float x_jog = current_position[X_AXIS] - .1;
         for (uint8_t i = 2; --i;) {
         }
         return;
       }
-      #endif
 
       switch (dual_x_carriage_mode) {
         case DXC_FULL_CONTROL_MODE:
     #ifdef DEBUG_DXC_MODE
 
       if (parser.seen('W')) {
-        SERIAL_ECHO_START();
-        SERIAL_ECHOPGM("IDEX mode: ");
+        DEBUG_ECHO_START();
+        DEBUG_ECHOPGM("Dual X Carriage Mode ");
         switch (dual_x_carriage_mode) {
-          case DXC_FULL_CONTROL_MODE:       SERIAL_ECHOPGM("DXC_FULL_CONTROL_MODE");       break;
-          case DXC_AUTO_PARK_MODE:          SERIAL_ECHOPGM("DXC_AUTO_PARK_MODE");          break;
-          case DXC_DUPLICATION_MODE:        SERIAL_ECHOPGM("DXC_DUPLICATION_MODE");        break;
-          case DXC_SCALED_DUPLICATION_MODE: SERIAL_ECHOPGM("DXC_SCALED_DUPLICATION_MODE"); break;
+          case DXC_FULL_CONTROL_MODE: DEBUG_ECHOPGM("FULL_CONTROL"); break;
+          case DXC_AUTO_PARK_MODE:    DEBUG_ECHOPGM("AUTO_PARK");    break;
+          case DXC_DUPLICATION_MODE:  DEBUG_ECHOPGM("DUPLICATION");  break;
+          case DXC_MIRRORED_MODE:     DEBUG_ECHOPGM("MIRRORED");     break;
         }
-        SERIAL_ECHOPAIR("\nActive Ext: ", int(active_extruder));
-        if (!active_extruder_parked) SERIAL_ECHOPGM(" NOT ");
-        SERIAL_ECHOPGM(" parked.");
-        SERIAL_ECHOPAIR("\nactive_extruder_x_pos: ", current_position[X_AXIS]);
-        SERIAL_ECHOPAIR("\ninactive_extruder_x_pos: ", inactive_extruder_x_pos);
-        SERIAL_ECHOPAIR("\nextruder_duplication_enabled: ", int(extruder_duplication_enabled));
-        SERIAL_ECHOPAIR("\nduplicate_extruder_x_offset: ", duplicate_extruder_x_offset);
-        SERIAL_ECHOPAIR("\nduplicate_extruder_temp_offset: ", duplicate_extruder_temp_offset);
-        SERIAL_ECHOPAIR("\ndelayed_move_time: ", delayed_move_time);
-        SERIAL_ECHOPAIR("\nX1 Home X: ", x_home_pos(0));
-        SERIAL_ECHOPAIR("\nX1_MIN_POS=", int(X1_MIN_POS));
-        SERIAL_ECHOPAIR("\nX1_MAX_POS=", int(X1_MAX_POS));
-        SERIAL_ECHOPAIR("\nX2 Home X: ", x_home_pos(1));
-        SERIAL_ECHOPAIR("\nX2_MIN_POS=", int(X2_MIN_POS));
-        SERIAL_ECHOPAIR("\nX2_MAX_POS=", int(X2_MAX_POS));
-        SERIAL_ECHOPAIR("\nX2_HOME_DIR=", int(X2_HOME_DIR));
-        SERIAL_ECHOPAIR("\nX2_HOME_POS=", int(X2_HOME_POS));
-        SERIAL_ECHOPAIR("\nDEFAULT_DUAL_X_CARRIAGE_MODE=", STRINGIFY(DEFAULT_DUAL_X_CARRIAGE_MODE));
-        SERIAL_ECHOPAIR("\nTOOLCHANGE_ZRAISE=", float(TOOLCHANGE_ZRAISE));
-        SERIAL_ECHOPAIR("\nDEFAULT_DUPLICATION_X_OFFSET=", int(DEFAULT_DUPLICATION_X_OFFSET));
-        SERIAL_EOL();
-
-        for (uint8_t i = 0; i < 2; i++) {
-          SERIAL_ECHOPAIR(" nozzle:", int(i));
-          LOOP_XYZ(j) {
-            SERIAL_ECHOPGM("    hotend_offset[");
-            SERIAL_CHAR(axis_codes[j]);
-            SERIAL_ECHOPAIR("_AXIS][", int(i));
-            SERIAL_ECHOPAIR("]=", hotend_offset[j][i]);
-          }
-          SERIAL_EOL();
+        DEBUG_ECHOPAIR("\nActive Ext: ", int(active_extruder));
+        if (!active_extruder_parked) DEBUG_ECHOPGM(" NOT ");
+        DEBUG_ECHOPGM(" parked.");
+        DEBUG_ECHOPAIR("\nactive_extruder_x_pos: ", current_position[X_AXIS]);
+        DEBUG_ECHOPAIR("\ninactive_extruder_x_pos: ", inactive_extruder_x_pos);
+        DEBUG_ECHOPAIR("\nextruder_duplication_enabled: ", int(extruder_duplication_enabled));
+        DEBUG_ECHOPAIR("\nduplicate_extruder_x_offset: ", duplicate_extruder_x_offset);
+        DEBUG_ECHOPAIR("\nduplicate_extruder_temp_offset: ", duplicate_extruder_temp_offset);
+        DEBUG_ECHOPAIR("\ndelayed_move_time: ", delayed_move_time);
+        DEBUG_ECHOPAIR("\nX1 Home X: ", x_home_pos(0), "\nX1_MIN_POS=", int(X1_MIN_POS), "\nX1_MAX_POS=", int(X1_MAX_POS));
+        DEBUG_ECHOPAIR("\nX2 Home X: ", x_home_pos(1), "\nX2_MIN_POS=", int(X2_MIN_POS), "\nX2_MAX_POS=", int(X2_MAX_POS));
+        DEBUG_ECHOPAIR("\nX2_HOME_DIR=", int(X2_HOME_DIR), "\nX2_HOME_POS=", int(X2_HOME_POS));
+        DEBUG_ECHOPAIR("\nDEFAULT_DUAL_X_CARRIAGE_MODE=", STRINGIFY(DEFAULT_DUAL_X_CARRIAGE_MODE));
+        DEBUG_ECHOPAIR("\nTOOLCHANGE_ZRAISE=", float(TOOLCHANGE_ZRAISE));
+        DEBUG_ECHOPAIR("\nDEFAULT_DUPLICATION_X_OFFSET=", int(DEFAULT_DUPLICATION_X_OFFSET));
+        DEBUG_EOL();
+
+        HOTEND_LOOP() {
+          DEBUG_ECHOPAIR(" nozzle:", int(e));
+          LOOP_XYZ(j) DEBUG_ECHOPAIR("  hotend_offset[", axis_codes[j], "_AXIS][", int(e), "]=", hotend_offset[j][e]);
+          DEBUG_EOL();
         }
-        SERIAL_EOL();
+        DEBUG_EOL();
       }
     #endif // DEBUG_DXC_MODE
   }

Marlin/src/gcode/feature/pause/M600.cpp

     if (
       active_extruder != target_extruder
       #if ENABLED(DUAL_X_CARRIAGE)
-        && dual_x_carriage_mode != DXC_DUPLICATION_MODE && dual_x_carriage_mode != DXC_SCALED_DUPLICATION_MODE
+        && dual_x_carriage_mode != DXC_DUPLICATION_MODE && dual_x_carriage_mode != DXC_MIRRORED_MODE
       #endif
     ) tool_change(target_extruder, 0, false);
   #endif

Marlin/src/lcd/language/language_de.h

 #define MSG_IDEX_MENU                       _UxGT("IDEX-Modus")
 #define MSG_IDEX_MODE_AUTOPARK              _UxGT("Autom. Parken")
 #define MSG_IDEX_MODE_DUPLICATE             _UxGT("Duplizieren")
-#define MSG_IDEX_MODE_SCALED_COPY           _UxGT("Skalierung kopieren")
+#define MSG_IDEX_MODE_MIRRORED_COPY         _UxGT("Spiegelkopie")
 #define MSG_IDEX_MODE_FULL_CTRL             _UxGT("vollstä. Kontrolle")
 #define MSG_IDEX_X_OFFSET                   _UxGT("2. Düse X")
 #define MSG_IDEX_Y_OFFSET                   _UxGT("2. Düse Y")

Marlin/src/lcd/language/language_en.h

 #ifndef MSG_IDEX_MODE_DUPLICATE
   #define MSG_IDEX_MODE_DUPLICATE             _UxGT("Duplication")
 #endif
-#ifndef MSG_IDEX_MODE_SCALED_COPY
-  #define MSG_IDEX_MODE_SCALED_COPY           _UxGT("Scaled copy")
+#ifndef MSG_IDEX_MODE_MIRRORED_COPY
+  #define MSG_IDEX_MODE_MIRRORED_COPY         _UxGT("Mirrored copy")
 #endif
 #ifndef MSG_IDEX_MODE_FULL_CTRL
   #define MSG_IDEX_MODE_FULL_CTRL             _UxGT("Full control")

Marlin/src/lcd/language/language_it.h

 #define MSG_IDEX_MENU                       _UxGT("Modo IDEX")
 #define MSG_IDEX_MODE_AUTOPARK              _UxGT("Auto-Park")
 #define MSG_IDEX_MODE_DUPLICATE             _UxGT("Duplicazione")
-#define MSG_IDEX_MODE_SCALED_COPY           _UxGT("Copia scalata")
+#define MSG_IDEX_MODE_MIRRORED_COPY         _UxGT("Copia speculare")
 #define MSG_IDEX_MODE_FULL_CTRL             _UxGT("Pieno controllo")
 #define MSG_IDEX_X_OFFSET                   _UxGT("2° ugello X")
 #define MSG_IDEX_Y_OFFSET                   _UxGT("2° ugello Y")

Marlin/src/lcd/language/language_ko_KR.h

 #define MSG_IDEX_MENU                       _UxGT("IDEX Mode")
 #define MSG_IDEX_MODE_AUTOPARK              _UxGT("Auto-Park")
 #define MSG_IDEX_MODE_DUPLICATE             _UxGT("Duplication")
-#define MSG_IDEX_MODE_SCALED_COPY           _UxGT("Scaled copy")
+#define MSG_IDEX_MODE_MIRRORED_COPY         _UxGT("미러 사본")
 #define MSG_IDEX_MODE_FULL_CTRL             _UxGT("Full control")
 #define MSG_IDEX_X_OFFSET                   _UxGT("2nd nozzle X")
 #define MSG_IDEX_Y_OFFSET                   _UxGT("2nd nozzle Y")

Marlin/src/lcd/language/language_pt-br.h

 #define MSG_IDEX_MENU                       _UxGT("Modo IDEX")
 #define MSG_IDEX_MODE_AUTOPARK              _UxGT("Auto-Estacionar")
 #define MSG_IDEX_MODE_DUPLICATE             _UxGT("Duplicação")
-#define MSG_IDEX_MODE_SCALED_COPY           _UxGT("Cópia em Escala")
+#define MSG_IDEX_MODE_MIRRORED_COPY         _UxGT("Cópia espelhada")
 #define MSG_IDEX_MODE_FULL_CTRL             _UxGT("Controle Total")
 #define MSG_IDEX_X_OFFSET                   _UxGT("2o bico X")
 #define MSG_IDEX_Y_OFFSET                   _UxGT("2o bico Y")

Marlin/src/lcd/language/language_sk.h

 #define MSG_IDEX_MENU                       _UxGT("IDEX mód")
 #define MSG_IDEX_MODE_AUTOPARK              _UxGT("Auto-parkovanie")
 #define MSG_IDEX_MODE_DUPLICATE             _UxGT("Duplikácia")
-#define MSG_IDEX_MODE_SCALED_COPY           _UxGT("Zmenšená kópia")
+#define MSG_IDEX_MODE_MIRRORED_COPY         _UxGT("Zrkadlená kópia")
 #define MSG_IDEX_MODE_FULL_CTRL             _UxGT("Plná kontrola")
 #define MSG_IDEX_X_OFFSET                   _UxGT("2. tryska X")
 #define MSG_IDEX_Y_OFFSET                   _UxGT("2. tryska Y")

Marlin/src/lcd/language/language_tr.h

 #define MSG_IDEX_MENU                       _UxGT("IDEX Modu")
 #define MSG_IDEX_MODE_AUTOPARK              _UxGT("Oto-Park")
 #define MSG_IDEX_MODE_DUPLICATE             _UxGT("Kopyala")
-#define MSG_IDEX_MODE_SCALED_COPY           _UxGT("Ölçeklenmiş Kopya")
+#define MSG_IDEX_MODE_MIRRORED_COPY         _UxGT("Yansıtılmış kopya")
 #define MSG_IDEX_MODE_FULL_CTRL             _UxGT("Tam Kontrol")
 #define MSG_IDEX_X_OFFSET                   _UxGT("2. nozul X")
 #define MSG_IDEX_Y_OFFSET                   _UxGT("2. nozul Y")

Marlin/src/lcd/menu/menu_configuration.cpp

       ? PSTR("M605 S1\nT0\nG28\nM605 S2 X200\nG28 X\nG1 X100")                // If Y or Z is not homed, do a full G28 first
       : PSTR("M605 S1\nT0\nM605 S2 X200\nG28 X\nG1 X100")
     );
-    //MENU_ITEM(gcode, MSG_IDEX_MODE_SCALED_COPY, need_g28
-    //  ? PSTR("M605 S1\nT0\nG28\nM605 S2 X200\nG28 X\nG1 X100\nM605 S3 X200")  // If Y or Z is not homed, do a full G28 first
-    //  : PSTR("M605 S1\nT0\nM605 S2 X200\nG28 X\nG1 X100\nM605 S3 X200")
-    //);
+    MENU_ITEM(gcode, MSG_IDEX_MODE_MIRRORED_COPY, need_g28
+      ? PSTR("M605 S1\nT0\nG28\nM605 S2 X200\nG28 X\nG1 X100\nM605 S3 X200")  // If Y or Z is not homed, do a full G28 first
+      : PSTR("M605 S1\nT0\nM605 S2 X200\nG28 X\nG1 X100\nM605 S3 X200")
+    );
     MENU_ITEM(gcode, MSG_IDEX_MODE_FULL_CTRL, PSTR("M605 S0\nG28 X"));
     MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(float52, MSG_IDEX_X_OFFSET , &hotend_offset[X_AXIS][1], MIN(X2_HOME_POS, X2_MAX_POS) - 25.0, MAX(X2_HOME_POS, X2_MAX_POS) + 25.0, _recalc_IDEX_settings);
     MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(float52, MSG_IDEX_Y_OFFSET , &hotend_offset[Y_AXIS][1], -10.0, 10.0, _recalc_IDEX_settings);

Marlin/src/module/motion.cpp

 #endif // !UBL_SEGMENTED
 
 #if HAS_DUPLICATION_MODE
-  bool extruder_duplication_enabled;
-       //scaled_duplication_mode;
+  bool extruder_duplication_enabled,
+       mirrored_duplication_mode;
 #endif
 
 #if ENABLED(MULTI_NOZZLE_DUPLICATION) && HOTENDS > 2
           active_extruder_parked = false;
           if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Clear active_extruder_parked");
           break;
-        case DXC_SCALED_DUPLICATION_MODE:
+        case DXC_MIRRORED_MODE:
         case DXC_DUPLICATION_MODE:
           if (active_extruder == 0) {
             if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPAIR("Set planner X", inactive_extruder_x_pos, " ... Line to X", current_position[X_AXIS] + duplicate_extruder_x_offset);

Marlin/src/module/motion.h

  * Duplication mode
  */
 #if HAS_DUPLICATION_MODE
-  extern bool extruder_duplication_enabled;       // Used in Dual X mode 2
-              //scaled_duplication_mode;            // Used in Dual X mode 3
+  extern bool extruder_duplication_enabled,       // Used in Dual X mode 2
+              mirrored_duplication_mode;          // Used in Dual X mode 3
 #endif
 
 #if ENABLED(MULTI_NOZZLE_DUPLICATION) && HOTENDS > 2
     DXC_FULL_CONTROL_MODE,
     DXC_AUTO_PARK_MODE,
     DXC_DUPLICATION_MODE,
-    DXC_SCALED_DUPLICATION_MODE
+    DXC_MIRRORED_MODE
   };
 
   extern DualXMode dual_x_carriage_mode;
-  extern float inactive_extruder_x_pos,           // used in mode 0 & 1
-               raised_parked_position[XYZE],      // used in mode 1
-               duplicate_extruder_x_offset;       // used in mode 2 & 3
-  extern bool active_extruder_parked;             // used in mode 1, 2 & 3
-  extern millis_t delayed_move_time;              // used in mode 1
-  extern int16_t duplicate_extruder_temp_offset;  // used in mode 2 & 3
+  extern float inactive_extruder_x_pos,           // Used in mode 0 & 1
+               raised_parked_position[XYZE],      // Used in mode 1
+               duplicate_extruder_x_offset;       // Used in mode 2 & 3
+  extern bool active_extruder_parked;             // Used in mode 1, 2 & 3
+  extern millis_t delayed_move_time;              // Used in mode 1
+  extern int16_t duplicate_extruder_temp_offset;  // Used in mode 2 & 3
 
   FORCE_INLINE bool dxc_is_duplicating() { return dual_x_carriage_mode >= DXC_DUPLICATION_MODE; }
 

Marlin/src/module/stepper.cpp

     #define X_APPLY_STEP(v,Q) do{ X_STEP_WRITE(v); X2_STEP_WRITE(v); }while(0)
   #endif
 #elif ENABLED(DUAL_X_CARRIAGE)
-  #define X_APPLY_DIR(v,ALWAYS) \
-    if (extruder_duplication_enabled || ALWAYS) { \
-      X_DIR_WRITE(v); \
-      X2_DIR_WRITE(v); \
-    } \
-    else { \
-      if (movement_extruder()) X2_DIR_WRITE(v); else X_DIR_WRITE(v); \
-    }
-  #define X_APPLY_STEP(v,ALWAYS) \
-    if (extruder_duplication_enabled || ALWAYS) { \
-      X_STEP_WRITE(v); \
-      X2_STEP_WRITE(v); \
-    } \
-    else { \
-      if (movement_extruder()) X2_STEP_WRITE(v); else X_STEP_WRITE(v); \
-    }
+  #define X_APPLY_DIR(v,ALWAYS) do{ \
+    if (extruder_duplication_enabled || ALWAYS) { X_DIR_WRITE(v); X2_DIR_WRITE(mirrored_duplication_mode ? !(v) : v); } \
+    else if (movement_extruder()) X2_DIR_WRITE(v); else X_DIR_WRITE(v); \
+  }while(0)
+  #define X_APPLY_STEP(v,ALWAYS) do{ \
+    if (extruder_duplication_enabled || ALWAYS) { X_STEP_WRITE(v); X2_STEP_WRITE(v); } \
+    else if (movement_extruder()) X2_STEP_WRITE(v); else X_STEP_WRITE(v); \
+  }while(0)
 #else
   #define X_APPLY_DIR(v,Q) X_DIR_WRITE(v)
   #define X_APPLY_STEP(v,Q) X_STEP_WRITE(v)

Marlin/src/module/tool_change.cpp

     if (DEBUGGING(LEVELING)) {
       DEBUG_ECHOPGM("Dual X Carriage Mode ");
       switch (dual_x_carriage_mode) {
-        case DXC_FULL_CONTROL_MODE: DEBUG_ECHOLNPGM("DXC_FULL_CONTROL_MODE"); break;
-        case DXC_AUTO_PARK_MODE: DEBUG_ECHOLNPGM("DXC_AUTO_PARK_MODE"); break;
-        case DXC_DUPLICATION_MODE: DEBUG_ECHOLNPGM("DXC_DUPLICATION_MODE"); break;
-        case DXC_SCALED_DUPLICATION_MODE: DEBUG_ECHOLNPGM("DXC_SCALED_DUPLICATION_MODE"); break;
+        case DXC_FULL_CONTROL_MODE: DEBUG_ECHOLNPGM("FULL_CONTROL"); break;
+        case DXC_AUTO_PARK_MODE:    DEBUG_ECHOLNPGM("AUTO_PARK");    break;
+        case DXC_DUPLICATION_MODE:  DEBUG_ECHOLNPGM("DUPLICATION");  break;
+        case DXC_MIRRORED_MODE:     DEBUG_ECHOLNPGM("MIRRORED");     break;
       }
     }
 
 
     planner.synchronize();
 
-    #if ENABLED(DUAL_X_CARRIAGE)  // Only T0 allowed if the Printer is in DXC_DUPLICATION_MODE or DXC_SCALED_DUPLICATION_MODE
+    #if ENABLED(DUAL_X_CARRIAGE)  // Only T0 allowed if the Printer is in DXC_DUPLICATION_MODE or DXC_MIRRORED_MODE
       if (tmp_extruder != 0 && dxc_is_duplicating())
          return invalid_extruder_error(tmp_extruder);
     #endif

config/default/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/3DFabXYZ/Migbot/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/AlephObjects/TAZ4/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/AliExpress/UM2pExt/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
   #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE

config/examples/Anet/A2/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Anet/A2plus/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Anet/A6/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
+//#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Anet/A8/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/AnyCubic/i3/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/ArmEd/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/BIBO/TouchX/cyclops/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/BIBO/TouchX/default/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/BQ/Hephestos/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/BQ/Hephestos_2/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/BQ/WITBOX/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Cartesio/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Creality/CR-10/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Creality/CR-10S/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Creality/CR-10_5S/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
   #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE

config/examples/Creality/CR-10mini/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Creality/CR-8/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Creality/Ender-2/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Creality/Ender-3/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Creality/Ender-4/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Einstart-S/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Felix/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/FlashForge/CreatorPro/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/FolgerTech/i3-2020/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Formbot/Raptor/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Formbot/T_Rex_2+/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 #define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS        // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS (X_BED_SIZE)     // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS  0               // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS (442-4.0)        // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1               // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS      // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS    // Set to X_MIN_POS
+  #define X1_MAX_POS (X_BED_SIZE) // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS  0           // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS (442-4.0)    // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR 1           // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS  // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
   #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE

config/examples/Formbot/T_Rex_3/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 #define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS  0     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS (442-4.0) // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE):           Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                              as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   :           Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                              that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) :           Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                              actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                              once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
-  //    Mode 3 (DXC_SCALED_DUPLICATION_MODE) :    Not working yet, but support routines in place
+  #define X1_MIN_POS X_MIN_POS    // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE   // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS  0           // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS (442-4.0)    // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR 1           // the second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS  // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
   #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE

config/examples/Geeetech/A10M/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Geeetech/A20M/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Geeetech/MeCreator2/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Geeetech/Prusa i3 Pro C/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Geeetech/Prusa i3 Pro W/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Infitary/i3-M508/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/JGAurora/A5/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/MakerParts/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Malyan/M150/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Malyan/M200/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Micromake/C1/enhanced/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Mks/Robin/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Mks/Sbase/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/RapideLite/RL200/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/RigidBot/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/SCARA/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Sanguinololu/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/TheBorg/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/TinyBoy2/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Tronxy/X3A/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Tronxy/X5S-2E/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
   #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE

config/examples/UltiMachine/Archim1/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/UltiMachine/Archim2/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/VORONDesign/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Velleman/K8200/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/Velleman/K8400/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/WASP/PowerWASP/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
   #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE

config/examples/Wanhao/Duplicator 6/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/Anycubic/Kossel/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/FLSUN/auto_calibrate/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/FLSUN/kossel/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/FLSUN/kossel_mini/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/Geeetech/Rostock 301/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/MKS/SBASE/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/Tevo Little Monster/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/generic/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/kossel_mini/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/delta/kossel_xl/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/gCreate/gMax1.5+/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/makibox/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/tvrrug/Round2/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100

config/examples/wt150/Configuration_adv.h

  * The inactive carriage is parked automatically to prevent oozing.
  * X1 is the left carriage, X2 the right. They park and home at opposite ends of the X axis.
  * By default the X2 stepper is assigned to the first unused E plug on the board.
+ * 
+ * The following Dual X Carriage modes can be selected with M605 S<mode>:
+ * 
+ *   0 : (FULL_CONTROL) The slicer has full control over both X-carriages and can achieve optimal travel
+ *       results as long as it supports dual X-carriages. (M605 S0)
+ * 
+ *   1 : (AUTO_PARK) The firmware automatically parks and unparks the X-carriages on tool-change so
+ *       that additional slicer support is not required. (M605 S1)
+ * 
+ *   2 : (DUPLICATION) The firmware moves the second X-carriage and extruder in synchronization with
+ *       the first X-carriage and extruder, to print 2 copies of the same object at the same time.
+ *       Set the constant X-offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S2 to initiate duplicated movement.
+ * 
+ *   3 : (MIRRORED) Formbot/Vivedino-inspired mirrored mode in which the second extruder duplicates
+ *       the movement of the first except the second extruder is reversed in the X axis.
+ *       Set the initial X offset and temperature differential with M605 S2 X[offs] R[deg] and
+ *       follow with M605 S3 to initiate mirrored movement.
  */
 //#define DUAL_X_CARRIAGE
 #if ENABLED(DUAL_X_CARRIAGE)
-  #define X1_MIN_POS X_MIN_POS  // set minimum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X1_MAX_POS X_BED_SIZE // set maximum to ensure first x-carriage doesn't hit the parked second X-carriage
-  #define X2_MIN_POS 80     // set minimum to ensure second x-carriage doesn't hit the parked first X-carriage
-  #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
-  #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
-  #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
-      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
-      // without modifying the firmware (through the "M218 T1 X???" command).
-      // Remember: you should set the second extruder x-offset to 0 in your slicer.
-
-  // There are a few selectable movement modes for dual x-carriages using M605 S<mode>
-  //    Mode 0 (DXC_FULL_CONTROL_MODE): Full control. The slicer has full control over both x-carriages and can achieve optimal travel results
-  //                                    as long as it supports dual x-carriages. (M605 S0)
-  //    Mode 1 (DXC_AUTO_PARK_MODE)   : Auto-park mode. The firmware will automatically park and unpark the x-carriages on tool changes so
-  //                                    that additional slicer support is not required. (M605 S1)
-  //    Mode 2 (DXC_DUPLICATION_MODE) : Duplication mode. The firmware will transparently make the second x-carriage and extruder copy all
-  //                                    actions of the first x-carriage. This allows the printer to print 2 arbitrary items at
-  //                                    once. (2nd extruder x offset and temp offset are set using: M605 S2 [Xnnn] [Rmmm])
+  #define X1_MIN_POS X_MIN_POS   // Set to X_MIN_POS
+  #define X1_MAX_POS X_BED_SIZE  // Set a maximum so the first X-carriage can't hit the parked second X-carriage
+  #define X2_MIN_POS    80       // Set a minimum to ensure the  second X-carriage can't hit the parked first X-carriage
+  #define X2_MAX_POS   353       // Set this to the distance between toolheads when both heads are homed
+  #define X2_HOME_DIR    1       // Set to 1. The second X-carriage always homes to the maximum endstop position
+  #define X2_HOME_POS X2_MAX_POS // Default X2 home position. Set to X2_MAX_POS.
+                      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
+                      // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
+                      // without modifying the firmware (through the "M218 T1 X???" command).
+                      // Remember: you should set the second extruder x-offset to 0 in your slicer.
 
   // This is the default power-up mode which can be later using M605.
-  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_FULL_CONTROL_MODE
+  #define DEFAULT_DUAL_X_CARRIAGE_MODE DXC_AUTO_PARK_MODE
 
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100