Mixing Extruder Feature

.travis.yml

@@ -136,6 +136,13 @@ script:
   - opt_enable EEPROM_SETTINGS EEPROM_CHITCHAT M100_FREE_MEMORY_WATCHER INCH_MODE_SUPPORT TEMPERATURE_UNITS_SUPPORT
   - build_marlin
   #
+  # Mixing Extruder
+  #
+  - restore_configs
+  - opt_enable MIXING_EXTRUDER
+  - opt_set MIXING_STEPPERS 2
+  - build_marlin
+  #
   # Test DUAL_X_CARRIAGE
   #
   - restore_configs

Marlin/Configuration.h

@@ -133,20 +133,34 @@
 // :[1,2,3,4]
 #define EXTRUDERS 1
 
-// For Cyclops or any "multi-extruder" that shares a single nozzle.
-//#define SINGLENOZZLE
-
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
 //#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
 //#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
+// For Cyclops or any "multi-extruder" that shares a single nozzle.
+//#define SINGLENOZZLE
+
+/**
+ * "Mixing Extruder"
+ *   - Adds a new code, M165, to set the current mix factors.
+ *   - Extends the stepping routines to move multiple steppers in proportion to the mix.
+ *   - Optional support for Repetier Host M163, M164, and virtual extruder.
+ *   - This implementation supports only a single extruder.
+ *   - Enable DIRECT_MIXING_IN_G1 for Pia Taubert's reference implementation
+ */
+//#define MIXING_EXTRUDER
+#ifdef MIXING_EXTRUDER
+  #define MIXING_STEPPERS 2        // Number of steppers in your mixing extruder
+  #define MIXING_VIRTUAL_TOOLS 16  // Use the Virtual Tool method with M163 and M164
+  //#define DIRECT_MIXING_IN_G1    // Allow ABCDHI mix factors in G1 movement commands
+#endif
+
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
 // 2 = X-Box 360 203Watts (the blue wire connected to PS_ON and the red wire to VCC)
 // :{1:'ATX',2:'X-Box 360'}
-
 #define POWER_SUPPLY 1
 
 // Define this to have the electronics keep the power supply off on startup. If you don't know what this is leave it.

Marlin/Marlin.h

@@ -171,37 +171,64 @@ void manage_inactivity(bool ignore_stepper_queue = false);
   #define disable_z() ;
 #endif
 
-#if HAS_E0_ENABLE
-  #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 */
-#endif
 
-#if (EXTRUDERS > 1) && HAS_E1_ENABLE
-  #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 */
-#endif
+#if ENABLED(MIXING_EXTRUDER)
+
+  /**
+   * Mixing steppers synchronize their enable (and direction) together
+   */
+  #if MIXING_STEPPERS > 3
+    #define  enable_e0() { E0_ENABLE_WRITE( E_ENABLE_ON); E1_ENABLE_WRITE( E_ENABLE_ON); E2_ENABLE_WRITE( E_ENABLE_ON); E3_ENABLE_WRITE( E_ENABLE_ON); }
+    #define disable_e0() { E0_ENABLE_WRITE(!E_ENABLE_ON); E1_ENABLE_WRITE(!E_ENABLE_ON); E2_ENABLE_WRITE(!E_ENABLE_ON); E3_ENABLE_WRITE(!E_ENABLE_ON); }
+  #elif MIXING_STEPPERS > 2
+    #define  enable_e0() { E0_ENABLE_WRITE( E_ENABLE_ON); E1_ENABLE_WRITE( E_ENABLE_ON); E2_ENABLE_WRITE( E_ENABLE_ON); }
+    #define disable_e0() { E0_ENABLE_WRITE(!E_ENABLE_ON); E1_ENABLE_WRITE(!E_ENABLE_ON); E2_ENABLE_WRITE(!E_ENABLE_ON); }
+  #else
+    #define  enable_e0() { E0_ENABLE_WRITE( E_ENABLE_ON); E1_ENABLE_WRITE( E_ENABLE_ON); }
+    #define disable_e0() { E0_ENABLE_WRITE(!E_ENABLE_ON); E1_ENABLE_WRITE(!E_ENABLE_ON); }
+  #endif
+  #define  enable_e1() NOOP
+  #define disable_e1() NOOP
+  #define  enable_e2() NOOP
+  #define disable_e2() NOOP
+  #define  enable_e3() NOOP
+  #define disable_e3() NOOP
+
+#else // !MIXING_EXTRUDER
+
+  #if HAS_E0_ENABLE
+    #define  enable_e0() E0_ENABLE_WRITE( E_ENABLE_ON)
+    #define disable_e0() E0_ENABLE_WRITE(!E_ENABLE_ON)
+  #else
+    #define  enable_e0() NOOP
+    #define disable_e0() NOOP
+  #endif
 
-#if (EXTRUDERS > 2) && HAS_E2_ENABLE
-  #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 */
-#endif
+  #if (EXTRUDERS > 1) && HAS_E1_ENABLE
+    #define enable_e1()  E1_ENABLE_WRITE( E_ENABLE_ON)
+    #define disable_e1() E1_ENABLE_WRITE(!E_ENABLE_ON)
+  #else
+    #define  enable_e1() NOOP
+    #define disable_e1() NOOP
+  #endif
 
-#if (EXTRUDERS > 3) && HAS_E3_ENABLE
-  #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 */
-#endif
+  #if (EXTRUDERS > 2) && HAS_E2_ENABLE
+    #define  enable_e2() E2_ENABLE_WRITE( E_ENABLE_ON)
+    #define disable_e2() E2_ENABLE_WRITE(!E_ENABLE_ON)
+  #else
+    #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 disable_e3() E3_ENABLE_WRITE(!E_ENABLE_ON)
+  #else
+    #define  enable_e3() NOOP
+    #define disable_e3() NOOP
+  #endif
+
+#endif // !MIXING_EXTRUDER
 
 /**
  * The axis order in all axis related arrays is X, Y, Z, E
@@ -371,6 +398,10 @@ extern uint8_t active_extruder;
   void print_heaterstates();
 #endif
 
+#if ENABLED(MIXING_EXTRUDER)
+  extern float mixing_factor[MIXING_STEPPERS];
+#endif
+
 void calculate_volumetric_multipliers();
 
 // Buzzer