Add DUAL_NOZZLE_DUPLICATION_MODE option

Marlin/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/SanityCheck.h

@@ -573,6 +573,23 @@
 #endif
 
 /**
+ * Basic 2-nozzle duplication mode
+ */
+#if ENABLED(DUAL_NOZZLE_DUPLICATION_MODE)
+  #if HOTENDS != 2
+    #error "DUAL_NOZZLE_DUPLICATION_MODE requires exactly 2 hotends."
+  #elif ENABLED(DUAL_X_CARRIAGE)
+    #error "DUAL_NOZZLE_DUPLICATION_MODE is incompatible with DUAL_X_CARRIAGE."
+  #elif ENABLED(SINGLENOZZLE)
+    #error "DUAL_NOZZLE_DUPLICATION_MODE is incompatible with SINGLENOZZLE."
+  #elif ENABLED(MIXING_EXTRUDER)
+    #error "DUAL_NOZZLE_DUPLICATION_MODE is incompatible with MIXING_EXTRUDER."
+  #elif ENABLED(SWITCHING_EXTRUDER)
+    #error "DUAL_NOZZLE_DUPLICATION_MODE is incompatible with SWITCHING_EXTRUDER."
+  #endif
+#endif
+
+/**
  * Test Extruder Pins
  */
 #if EXTRUDERS > 3

Marlin/example_configurations/Cartesio/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/Felix/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/Hephestos/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/Hephestos_2/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/K8200/Configuration_adv.h

@@ -335,7 +335,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/K8400/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/RigidBot/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/SCARA/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/TAZ4/Configuration_adv.h

@@ -337,7 +337,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/WITBOX/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

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

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/delta/generic/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

@@ -334,7 +334,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/makibox/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

@@ -329,7 +329,10 @@
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
 
-//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+// Allow duplication mode with a basic dual-nozzle extruder
+//#define DUAL_NOZZLE_DUPLICATION_MODE
+
+// By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false
 #define INVERT_Z_STEP_PIN false