Merge pull request #10772 from GMagician/2.0.x-address-#10766

[2.0.x] Fix switching extruder

Marlin/src/Marlin.cpp

   #include "feature/fanmux.h"
 #endif
 
-#if (ENABLED(SWITCHING_EXTRUDER) && !DONT_SWITCH) || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)
+#if DO_SWITCH_EXTRUDER || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)
   #include "module/tool_change.h"
 #endif
 
     setup_endstop_interrupts();
   #endif
 
-  #if ENABLED(SWITCHING_EXTRUDER) && !DONT_SWITCH
+  #if DO_SWITCH_EXTRUDER
     move_extruder_servo(0);  // Initialize extruder servo
   #endif
 

Marlin/src/gcode/config/M218.cpp

  *   T<tool>
  *   X<xoffset>
  *   Y<yoffset>
- *   Z<zoffset> - Available with DUAL_X_CARRIAGE and SWITCHING_NOZZLE
+ *   Z<zoffset> - Available with DUAL_X_CARRIAGE, SWITCHING_NOZZLE and PARKING_EXTRUDER
  */
 void GcodeSuite::M218() {
   if (get_target_extruder_from_command() || target_extruder == 0) return;
     report = false;
   }
 
-  #if ENABLED(DUAL_X_CARRIAGE) || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)
+  #if HAS_HOTEND_OFFSET_Z
     if (parser.seenval('Z')) {
       hotend_offset[Z_AXIS][target_extruder] = parser.value_linear_units();
       report = false;
       SERIAL_ECHO(hotend_offset[X_AXIS][e]);
       SERIAL_CHAR(',');
       SERIAL_ECHO(hotend_offset[Y_AXIS][e]);
-      #if ENABLED(DUAL_X_CARRIAGE) || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)
+      #if HAS_HOTEND_OFFSET_Z
         SERIAL_CHAR(',');
         SERIAL_ECHO(hotend_offset[Z_AXIS][e]);
       #endif

Marlin/src/inc/Conditionals_LCD.h

   #undef HOTEND_OFFSET_Y
 #else                                                         // Two hotends
   #define HOTENDS       EXTRUDERS
-  #if ENABLED(SWITCHING_NOZZLE) && !defined(HOTEND_OFFSET_Z)
-    #define HOTEND_OFFSET_Z { 0 }
-  #endif
 #endif
 
 #define HOTEND_LOOP() for (int8_t e = 0; e < HOTENDS; e++)
   #define E_MANUAL        EXTRUDERS
 #endif
 
+#define DO_SWITCH_EXTRUDER (ENABLED(SWITCHING_EXTRUDER) && (DISABLED(SWITCHING_NOZZLE) || SWITCHING_EXTRUDER_SERVO_NR != SWITCHING_NOZZLE_SERVO_NR))
+
 /**
  * DISTINCT_E_FACTORS affects how some E factors are accessed
  */

Marlin/src/inc/Conditionals_post.h

 /**
  * Default hotend offsets, if not defined
  */
+#define HAS_HOTEND_OFFSET_Z (HOTENDS > 1 && (ENABLED(DUAL_X_CARRIAGE) || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)))
 #if HOTENDS > 1
   #ifndef HOTEND_OFFSET_X
     #define HOTEND_OFFSET_X { 0 } // X offsets for each extruder
   #ifndef HOTEND_OFFSET_Y
     #define HOTEND_OFFSET_Y { 0 } // Y offsets for each extruder
   #endif
-  #if !defined(HOTEND_OFFSET_Z) && (ENABLED(DUAL_X_CARRIAGE) || ENABLED(SWITCHING_NOZZLE))
+  #if HAS_HOTEND_OFFSET_Z && !defined(HOTEND_OFFSET_Z)
     #define HOTEND_OFFSET_Z { 0 }
   #endif
 #endif

Marlin/src/lcd/ultralcd.cpp

     else
       MENU_ITEM(gcode, MSG_AUTO_HOME, PSTR("G28"));
 
-    #if ENABLED(SWITCHING_EXTRUDER)
+    #if ENABLED(SWITCHING_EXTRUDER) || ENABLED(SWITCHING_NOZZLE)
 
       #if EXTRUDERS == 4
         switch (active_extruder) {

Marlin/src/module/configuration_store.cpp

         SERIAL_ECHOPAIR_P(port, "  M218 T", (int)e);
         SERIAL_ECHOPAIR_P(port, " X", LINEAR_UNIT(hotend_offset[X_AXIS][e]));
         SERIAL_ECHOPAIR_P(port, " Y", LINEAR_UNIT(hotend_offset[Y_AXIS][e]));
-        #if ENABLED(DUAL_X_CARRIAGE) || ENABLED(SWITCHING_NOZZLE) ||ENABLED(PARKING_EXTRUDER)
+        #if HAS_HOTEND_OFFSET_Z
           SERIAL_ECHOPAIR_P(port, " Z", LINEAR_UNIT(hotend_offset[Z_AXIS][e]));
         #endif
         SERIAL_EOL_P(port);

Marlin/src/module/tool_change.cpp

   #include "../feature/fanmux.h"
 #endif
 
-#if ENABLED(SWITCHING_EXTRUDER)
+#if DO_SWITCH_EXTRUDER
 
   #if EXTRUDERS > 3
     #define REQ_ANGLES 4
 
 #endif // DUAL_X_CARRIAGE
 
-#define DO_SWITCH_EXTRUDER (SWITCHING_EXTRUDER_SERVO_NR != SWITCHING_NOZZLE_SERVO_NR)
-
 /**
  * Perform a tool-change, which may result in moving the
  * previous tool out of the way and the new tool into place.

Marlin/src/module/tool_change.h

 
 #include "../inc/MarlinConfig.h"
 
-#if ENABLED(SWITCHING_EXTRUDER)
+#if DO_SWITCH_EXTRUDER
   void move_extruder_servo(const uint8_t e);
 #endif