Merge pull request #4271 from thinkyhead/rc_X_DUAL_STEPPER_DRIVERS

X_DUAL_STEPPER_DRIVERS

Marlin/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/Marlin.h

@@ -134,73 +134,69 @@ void manage_inactivity(bool ignore_stepper_queue = false);
   extern bool extruder_duplication_enabled;
 #endif
 
-#if ENABLED(DUAL_X_CARRIAGE) && HAS_X_ENABLE && HAS_X2_ENABLE
-  #define  enable_x() do { X_ENABLE_WRITE( X_ENABLE_ON); X2_ENABLE_WRITE( X_ENABLE_ON); } while (0)
-  #define disable_x() do { X_ENABLE_WRITE(!X_ENABLE_ON); X2_ENABLE_WRITE(!X_ENABLE_ON); axis_known_position[X_AXIS] = false; } while (0)
+#if HAS_X2_ENABLE
+  #define  enable_x() do{ X_ENABLE_WRITE( X_ENABLE_ON); X2_ENABLE_WRITE( X_ENABLE_ON); }while(0)
+  #define disable_x() do{ X_ENABLE_WRITE(!X_ENABLE_ON); X2_ENABLE_WRITE(!X_ENABLE_ON); axis_known_position[X_AXIS] = false; }while(0)
 #elif HAS_X_ENABLE
   #define  enable_x() X_ENABLE_WRITE( X_ENABLE_ON)
-  #define disable_x() { X_ENABLE_WRITE(!X_ENABLE_ON); axis_known_position[X_AXIS] = false; }
+  #define disable_x() do{ X_ENABLE_WRITE(!X_ENABLE_ON); axis_known_position[X_AXIS] = false; }while(0)
 #else
-  #define enable_x() ;
-  #define disable_x() ;
+  #define  enable_x() NOOP
+  #define disable_x() NOOP
 #endif
 
-#if HAS_Y_ENABLE
-  #if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-    #define  enable_y() { Y_ENABLE_WRITE( Y_ENABLE_ON); Y2_ENABLE_WRITE(Y_ENABLE_ON); }
-    #define disable_y() { Y_ENABLE_WRITE(!Y_ENABLE_ON); Y2_ENABLE_WRITE(!Y_ENABLE_ON); axis_known_position[Y_AXIS] = false; }
-  #else
-    #define  enable_y() Y_ENABLE_WRITE( Y_ENABLE_ON)
-    #define disable_y() { Y_ENABLE_WRITE(!Y_ENABLE_ON); axis_known_position[Y_AXIS] = false; }
-  #endif
+#if HAS_Y2_ENABLE
+  #define  enable_y() do{ Y_ENABLE_WRITE( Y_ENABLE_ON); Y2_ENABLE_WRITE(Y_ENABLE_ON); }while(0)
+  #define disable_y() do{ Y_ENABLE_WRITE(!Y_ENABLE_ON); Y2_ENABLE_WRITE(!Y_ENABLE_ON); axis_known_position[Y_AXIS] = false; }while(0)
+#elif HAS_Y_ENABLE
+  #define  enable_y() Y_ENABLE_WRITE( Y_ENABLE_ON)
+  #define disable_y() do{ Y_ENABLE_WRITE(!Y_ENABLE_ON); axis_known_position[Y_AXIS] = false; }while(0)
 #else
-  #define enable_y() ;
-  #define disable_y() ;
+  #define  enable_y() NOOP
+  #define disable_y() NOOP
 #endif
 
-#if HAS_Z_ENABLE
-  #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
-    #define  enable_z() { Z_ENABLE_WRITE( Z_ENABLE_ON); Z2_ENABLE_WRITE(Z_ENABLE_ON); }
-    #define disable_z() { Z_ENABLE_WRITE(!Z_ENABLE_ON); Z2_ENABLE_WRITE(!Z_ENABLE_ON); axis_known_position[Z_AXIS] = false; }
-  #else
-    #define  enable_z() Z_ENABLE_WRITE( Z_ENABLE_ON)
-    #define disable_z() { Z_ENABLE_WRITE(!Z_ENABLE_ON); axis_known_position[Z_AXIS] = false; }
-  #endif
+#if HAS_Z2_ENABLE
+  #define  enable_z() do{ Z_ENABLE_WRITE( Z_ENABLE_ON); Z2_ENABLE_WRITE(Z_ENABLE_ON); }while(0)
+  #define disable_z() do{ Z_ENABLE_WRITE(!Z_ENABLE_ON); Z2_ENABLE_WRITE(!Z_ENABLE_ON); axis_known_position[Z_AXIS] = false; }while(0)
+#elif HAS_Z_ENABLE
+  #define  enable_z() Z_ENABLE_WRITE( Z_ENABLE_ON)
+  #define disable_z() do{ Z_ENABLE_WRITE(!Z_ENABLE_ON); axis_known_position[Z_AXIS] = false; }while(0)
 #else
-  #define enable_z() ;
-  #define disable_z() ;
+  #define  enable_z() NOOP
+  #define disable_z() NOOP
 #endif
 
 #if HAS_E0_ENABLE
-  #define enable_e0()  E0_ENABLE_WRITE( E_ENABLE_ON)
+  #define  enable_e0() E0_ENABLE_WRITE( E_ENABLE_ON)
   #define disable_e0() E0_ENABLE_WRITE(!E_ENABLE_ON)
 #else
-  #define enable_e0()  /* nothing */
-  #define disable_e0() /* nothing */
+  #define  enable_e0() NOOP
+  #define disable_e0() NOOP
 #endif
 
 #if (EXTRUDERS > 1) && HAS_E1_ENABLE
-  #define enable_e1()  E1_ENABLE_WRITE( E_ENABLE_ON)
+  #define  enable_e1() E1_ENABLE_WRITE( E_ENABLE_ON)
   #define disable_e1() E1_ENABLE_WRITE(!E_ENABLE_ON)
 #else
-  #define enable_e1()  /* nothing */
-  #define disable_e1() /* nothing */
+  #define  enable_e1() NOOP
+  #define disable_e1() NOOP
 #endif
 
 #if (EXTRUDERS > 2) && HAS_E2_ENABLE
-  #define enable_e2()  E2_ENABLE_WRITE( E_ENABLE_ON)
+  #define  enable_e2() E2_ENABLE_WRITE( E_ENABLE_ON)
   #define disable_e2() E2_ENABLE_WRITE(!E_ENABLE_ON)
 #else
-  #define enable_e2()  /* nothing */
-  #define disable_e2() /* nothing */
+  #define  enable_e2() NOOP
+  #define disable_e2() NOOP
 #endif
 
 #if (EXTRUDERS > 3) && HAS_E3_ENABLE
-  #define enable_e3()  E3_ENABLE_WRITE( E_ENABLE_ON)
+  #define  enable_e3() E3_ENABLE_WRITE( E_ENABLE_ON)
   #define disable_e3() E3_ENABLE_WRITE(!E_ENABLE_ON)
 #else
-  #define enable_e3()  /* nothing */
-  #define disable_e3() /* nothing */
+  #define  enable_e3() NOOP
+  #define disable_e3() NOOP
 #endif
 
 /**

Marlin/SanityCheck.h

@@ -76,8 +76,14 @@
 /**
  * Dual Stepper Drivers
  */
-#if ENABLED(Z_DUAL_STEPPER_DRIVERS) && ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  #error "You cannot have dual stepper drivers for both Y and Z."
+#if ENABLED(X_DUAL_STEPPER_DRIVERS) && ENABLED(DUAL_X_CARRIAGE)
+  #error "DUAL_X_CARRIAGE is not compatible with X_DUAL_STEPPER_DRIVERS."
+#elif ENABLED(X_DUAL_STEPPER_DRIVERS) && (!HAS_X2_ENABLE || !HAS_X2_STEP || !HAS_X2_DIR)
+  #error "X_DUAL_STEPPER_DRIVERS requires X2 pins (and an extra E plug)."
+#elif ENABLED(Y_DUAL_STEPPER_DRIVERS) && (!HAS_Y2_ENABLE || !HAS_Y2_STEP || !HAS_Y2_DIR)
+  #error "Y_DUAL_STEPPER_DRIVERS requires Y2 pins (and an extra E plug)."
+#elif ENABLED(Z_DUAL_STEPPER_DRIVERS) && (!HAS_Z2_ENABLE || !HAS_Z2_STEP || !HAS_Z2_DIR)
+  #error "Z_DUAL_STEPPER_DRIVERS requires Z2 pins (and an extra E plug)."
 #endif
 
 /**
@@ -152,14 +158,6 @@
     #error "EXTRUDERS must be 1 with HEATERS_PARALLEL."
   #endif
 
-  #if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-    #error "EXTRUDERS must be 1 with Y_DUAL_STEPPER_DRIVERS."
-  #endif
-
-  #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
-    #error "EXTRUDERS must be 1 with Z_DUAL_STEPPER_DRIVERS."
-  #endif
-
 #elif ENABLED(SINGLENOZZLE)
   #error "SINGLENOZZLE requires 2 or more EXTRUDERS."
 #endif

Marlin/example_configurations/Cartesio/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/Felix/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/Hephestos/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/Hephestos_2/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/K8200/Configuration_adv.h

@@ -235,11 +235,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -261,14 +278,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/RigidBot/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/SCARA/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/TAZ4/Configuration_adv.h

@@ -237,11 +237,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -263,14 +280,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/WITBOX/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/delta/biv2.5/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/delta/generic/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

@@ -234,11 +234,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -260,14 +277,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/makibox/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

@@ -229,11 +229,28 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
 // A single Z stepper driver is usually used to drive 2 stepper motors.
-// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
-// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
-// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
-// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
 //#define Z_DUAL_STEPPER_DRIVERS
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
@@ -255,14 +272,6 @@
 
 #endif // Z_DUAL_STEPPER_DRIVERS
 
-// Same again but for Y Axis.
-//#define Y_DUAL_STEPPER_DRIVERS
-
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  // Define if the two Y drives need to rotate in opposite directions
-  #define INVERT_Y2_VS_Y_DIR true
-#endif
-
 // Enable this for dual x-carriage printers.
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage

Marlin/pins.h

@@ -369,8 +369,8 @@
 #define __EPIN(p,q) E##p##_##q##_PIN
 #define _EPIN(p,q) __EPIN(p,q)
 
-#if ENABLED(DUAL_X_CARRIAGE)
-  // The X2 axis, if any, should be the next open extruder port
+// The X2 axis, if any, should be the next open extruder port
+#if ENABLED(DUAL_X_CARRIAGE) || ENABLED(X_DUAL_STEPPER_DRIVERS)
   #ifndef X2_STEP_PIN
     #define X2_STEP_PIN   _EPIN(EXTRUDERS, STEP)
     #define X2_DIR_PIN    _EPIN(EXTRUDERS, DIR)
@@ -378,25 +378,32 @@
   #endif
   #undef _X2_PINS
   #define _X2_PINS X2_STEP_PIN, X2_DIR_PIN, X2_ENABLE_PIN,
-  #define Y2_Z2_E_INDEX INCREMENT(EXTRUDERS)
+  #define Y2_E_INDEX INCREMENT(EXTRUDERS)
 #else
-  #define Y2_Z2_E_INDEX EXTRUDERS
+  #define Y2_E_INDEX EXTRUDERS
 #endif
 
 // The Y2 axis, if any, should be the next open extruder port
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS) && !defined(Y2_STEP_PIN)
-  #define Y2_STEP_PIN   _EPIN(Y2_Z2_E_INDEX, STEP)
-  #define Y2_DIR_PIN    _EPIN(Y2_Z2_E_INDEX, DIR)
-  #define Y2_ENABLE_PIN _EPIN(Y2_Z2_E_INDEX, ENABLE)
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  #ifndef Y2_STEP_PIN
+    #define Y2_STEP_PIN   _EPIN(Y2_E_INDEX, STEP)
+    #define Y2_DIR_PIN    _EPIN(Y2_E_INDEX, DIR)
+    #define Y2_ENABLE_PIN _EPIN(Y2_E_INDEX, ENABLE)
+  #endif
   #undef _Y2_PINS
   #define _Y2_PINS Y2_STEP_PIN, Y2_DIR_PIN, Y2_ENABLE_PIN,
+  #define Z2_E_INDEX INCREMENT(Y2_E_INDEX)
+#else
+  #define Z2_E_INDEX Y2_E_INDEX
 #endif
 
 // The Z2 axis, if any, should be the next open extruder port
-#if ENABLED(Z_DUAL_STEPPER_DRIVERS) && !defined(Z2_STEP_PIN)
-  #define Z2_STEP_PIN   _EPIN(Y2_Z2_E_INDEX, STEP)
-  #define Z2_DIR_PIN    _EPIN(Y2_Z2_E_INDEX, DIR)
-  #define Z2_ENABLE_PIN _EPIN(Y2_Z2_E_INDEX, ENABLE)
+#if ENABLED(Z_DUAL_STEPPER_DRIVERS)
+  #ifndef Z2_STEP_PIN
+    #define Z2_STEP_PIN   _EPIN(Z2_E_INDEX, STEP)
+    #define Z2_DIR_PIN    _EPIN(Z2_E_INDEX, DIR)
+    #define Z2_ENABLE_PIN _EPIN(Z2_E_INDEX, ENABLE)
+  #endif
   #undef _Z2_PINS
   #define _Z2_PINS Z2_STEP_PIN, Z2_DIR_PIN, Z2_ENABLE_PIN,
 #endif

Marlin/stepper.cpp

@@ -120,7 +120,10 @@ unsigned short Stepper::OCR1A_nominal;
 
 volatile long Stepper::endstops_trigsteps[3];
 
-#if ENABLED(DUAL_X_CARRIAGE)
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  #define X_APPLY_DIR(v,Q) do{ X_DIR_WRITE(v); X2_DIR_WRITE((v) != INVERT_X2_VS_X_DIR); }while(0)
+  #define X_APPLY_STEP(v,Q) do{ X_STEP_WRITE(v); X2_STEP_WRITE(v); }while(0)
+#elif ENABLED(DUAL_X_CARRIAGE)
   #define X_APPLY_DIR(v,ALWAYS) \
     if (extruder_duplication_enabled || ALWAYS) { \
       X_DIR_WRITE(v); \
@@ -143,15 +146,15 @@ volatile long Stepper::endstops_trigsteps[3];
 #endif
 
 #if ENABLED(Y_DUAL_STEPPER_DRIVERS)
-  #define Y_APPLY_DIR(v,Q) { Y_DIR_WRITE(v); Y2_DIR_WRITE((v) != INVERT_Y2_VS_Y_DIR); }
-  #define Y_APPLY_STEP(v,Q) { Y_STEP_WRITE(v); Y2_STEP_WRITE(v); }
+  #define Y_APPLY_DIR(v,Q) do{ Y_DIR_WRITE(v); Y2_DIR_WRITE((v) != INVERT_Y2_VS_Y_DIR); }while(0)
+  #define Y_APPLY_STEP(v,Q) do{ Y_STEP_WRITE(v); Y2_STEP_WRITE(v); }while(0)
 #else
   #define Y_APPLY_DIR(v,Q) Y_DIR_WRITE(v)
   #define Y_APPLY_STEP(v,Q) Y_STEP_WRITE(v)
 #endif
 
 #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
-  #define Z_APPLY_DIR(v,Q) { Z_DIR_WRITE(v); Z2_DIR_WRITE(v); }
+  #define Z_APPLY_DIR(v,Q) do{ Z_DIR_WRITE(v); Z2_DIR_WRITE(v); }while(0)
   #if ENABLED(Z_DUAL_ENDSTOPS)
     #define Z_APPLY_STEP(v,Q) \
     if (performing_homing) { \
@@ -169,7 +172,7 @@ volatile long Stepper::endstops_trigsteps[3];
       Z2_STEP_WRITE(v); \
     }
   #else
-    #define Z_APPLY_STEP(v,Q) { Z_STEP_WRITE(v); Z2_STEP_WRITE(v); }
+    #define Z_APPLY_STEP(v,Q) do{ Z_STEP_WRITE(v); Z2_STEP_WRITE(v); }while(0)
   #endif
 #else
   #define Z_APPLY_DIR(v,Q) Z_DIR_WRITE(v)
@@ -669,14 +672,15 @@ void Stepper::init() {
 
   // Initialize Step Pins
   #if HAS_X_STEP
-    AXIS_INIT(x, X, X);
-    #if ENABLED(DUAL_X_CARRIAGE) && HAS_X2_STEP
-      AXIS_INIT(x, X2, X);
+    #if ENABLED(X_DUAL_STEPPER_DRIVERS) || ENABLED(DUAL_X_CARRIAGE)
+      X2_STEP_INIT;
+      X2_STEP_WRITE(INVERT_X_STEP_PIN);
     #endif
+    AXIS_INIT(x, X, X);
   #endif
 
   #if HAS_Y_STEP
-    #if ENABLED(Y_DUAL_STEPPER_DRIVERS) && HAS_Y2_STEP
+    #if ENABLED(Y_DUAL_STEPPER_DRIVERS)
       Y2_STEP_INIT;
       Y2_STEP_WRITE(INVERT_Y_STEP_PIN);
     #endif
@@ -684,7 +688,7 @@ void Stepper::init() {
   #endif
 
   #if HAS_Z_STEP
-    #if ENABLED(Z_DUAL_STEPPER_DRIVERS) && HAS_Z2_STEP
+    #if ENABLED(Z_DUAL_STEPPER_DRIVERS)
       Z2_STEP_INIT;
       Z2_STEP_WRITE(INVERT_Z_STEP_PIN);
     #endif

Marlin/stepper_indirection.h

@@ -60,7 +60,7 @@
 #define X_ENABLE_READ READ(X_ENABLE_PIN)
 
 // X2 motor
-#if ENABLED(DUAL_X_CARRIAGE)
+#if HAS_X2_ENABLE
   #define X2_STEP_INIT SET_OUTPUT(X2_STEP_PIN)
   #define X2_STEP_WRITE(STATE) WRITE(X2_STEP_PIN,STATE)
   #define X2_STEP_READ READ(X2_STEP_PIN)
@@ -88,7 +88,7 @@
 #define Y_ENABLE_READ READ(Y_ENABLE_PIN)
 
 // Y2 motor
-#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+#if HAS_Y2_ENABLE
   #define Y2_STEP_INIT SET_OUTPUT(Y2_STEP_PIN)
   #define Y2_STEP_WRITE(STATE) WRITE(Y2_STEP_PIN,STATE)
   #define Y2_STEP_READ READ(Y2_STEP_PIN)
@@ -116,7 +116,7 @@
 #define Z_ENABLE_READ READ(Z_ENABLE_PIN)
 
 // Z2 motor
-#if ENABLED(Z_DUAL_STEPPER_DRIVERS)
+#if HAS_Z2_ENABLE
   #define Z2_STEP_INIT SET_OUTPUT(Z2_STEP_PIN)
   #define Z2_STEP_WRITE(STATE) WRITE(Z2_STEP_PIN,STATE)
   #define Z2_STEP_READ READ(Z2_STEP_PIN)