Marlin 2.1.2.1 Config: 2 Hotend loops, one Extruder, reasighn E1 to U pins

Hello,

I'm using the MKS Gen L v1 board, Marlin 2.1.2.1 with aim to make configuration of XYZE0U with 2 hotend loops with only one extruder in use.

I aim to reassign E1 to unused or virtual pins and use the current E1 pins for a new U axis.

What are the minimum changes needed in the existing configuration to add U axis with min end stop plug?

Any help or suggestions would be appreciated.

Thank you.

Additional driver are used sequentially

I then H then K then U then V then W

These are the internal names used by marlin

So you setup I axis, then you name it U (with AXIS4_NAME) for your gcode if that is what you want

These are all the changes from your provided config files

diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 20802a2839..2004334dab 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -88,6 +88,10 @@
 // Choose the name from boards.h that matches your setup
 #ifndef MOTHERBOARD
   #define MOTHERBOARD BOARD_MKS_GEN_L
+  #define I_STOP_PIN 2
+  #define X_STOP_PIN 3
+  #define Y_STOP_PIN 14
+  #define Z_STOP_PIN 18
 #endif
 
 /**
@@ -166,14 +170,14 @@
 //#define Z2_DRIVER_TYPE A4988
 //#define Z3_DRIVER_TYPE A4988
 //#define Z4_DRIVER_TYPE A4988
-//#define I_DRIVER_TYPE  A4988
+#define I_DRIVER_TYPE DRV8825
 //#define J_DRIVER_TYPE  A4988
 //#define K_DRIVER_TYPE  A4988
 //#define U_DRIVER_TYPE  A4988
 //#define V_DRIVER_TYPE  A4988
 //#define W_DRIVER_TYPE  A4988
 #define E0_DRIVER_TYPE DRV8825
-#define E1_DRIVER_TYPE DRV8825
+//#define E1_DRIVER_TYPE DRV8825
 //#define E2_DRIVER_TYPE A4988
 //#define E3_DRIVER_TYPE A4988
 //#define E4_DRIVER_TYPE A4988
@@ -199,7 +203,7 @@
  * Regardless of these settings the axes are internally named I, J, K, U, V, W.
  */
 #ifdef I_DRIVER_TYPE
-  #define AXIS4_NAME 'A' // :['A', 'B', 'C', 'U', 'V', 'W']
+  #define AXIS4_NAME 'U' // :['A', 'B', 'C', 'U', 'V', 'W']
   #define AXIS4_ROTATES
 #endif
 #ifdef J_DRIVER_TYPE
@@ -227,7 +231,7 @@
 
 // This defines the number of extruders      //  extruders ****************************************************
 // :[0, 1, 2, 3, 4, 5, 6, 7, 8]
-#define EXTRUDERS 2                     //**************************************************
+#define EXTRUDERS 1                     //**************************************************
 
 // Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
 #define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
@@ -537,7 +541,7 @@
  *
  */
 #define TEMP_SENSOR_0 -3
-#define TEMP_SENSOR_1 1
+#define TEMP_SENSOR_1 0
 #define TEMP_SENSOR_2 0
 #define TEMP_SENSOR_3 0
 #define TEMP_SENSOR_4 0
@@ -1036,7 +1040,7 @@
 #define USE_XMIN_PLUG
 #define USE_YMIN_PLUG
 #define USE_ZMIN_PLUG
-//#define USE_IMIN_PLUG
+#define USE_IMIN_PLUG
 //#define USE_JMIN_PLUG
 //#define USE_KMIN_PLUG
 //#define USE_UMIN_PLUG
@@ -1169,14 +1173,14 @@
  * Override with M92
  *                                      X, Y, Z [, I [, J [, K...]]], E0 [, E1[, E2...]]
  */
-#define DEFAULT_AXIS_STEPS_PER_UNIT     { 400, 400, 400, 400 }   // { 80, 80, 400, 500 }
+#define DEFAULT_AXIS_STEPS_PER_UNIT     { 400, 400, 400, 400, 400 }   // { 80, 80, 400, 500 }
 
 /**
  * Default Max Feed Rate (linear=mm/s, rotational=°/s)
  * Override with M203
  *                                      X, Y, Z [, I [, J [, K...]]], E0 [, E1[, E2...]]
  */
-#define DEFAULT_MAX_FEEDRATE          { 300, 300, 300, 300 }  // { 300, 300, 5, 25 }
+#define DEFAULT_MAX_FEEDRATE          { 300, 300, 300, 300, 300 }  // { 300, 300, 5, 25 }
 
 //#define LIMITED_MAX_FR_EDITING        // Limit edit via M203 or LCD to DEFAULT_MAX_FEEDRATE * 2
 #if ENABLED(LIMITED_MAX_FR_EDITING)
@@ -1189,7 +1193,7 @@
  * Override with M201
  *                                      X, Y, Z [, I [, J [, K...]]], E0 [, E1[, E2...]]
  */
-#define DEFAULT_MAX_ACCELERATION      { 3000, 3000, 3000, 3000 } //{ 3000, 3000, 100, 10000 }
+#define DEFAULT_MAX_ACCELERATION      { 3000, 3000, 3000, 3000, 3000 } //{ 3000, 3000, 100, 10000 }
 
 //#define LIMITED_MAX_ACCEL_EDITING     // Limit edit via M201 or LCD to DEFAULT_MAX_ACCELERATION * 2
 #if ENABLED(LIMITED_MAX_ACCEL_EDITING)
@@ -1611,7 +1615,7 @@
 #define Y_ENABLE_ON 0
 #define Z_ENABLE_ON 0
 #define E_ENABLE_ON 0 // For all extruders
-//#define I_ENABLE_ON 0
+#define I_ENABLE_ON 0
 //#define J_ENABLE_ON 0
 //#define K_ENABLE_ON 0
 //#define U_ENABLE_ON 0
@@ -1623,7 +1627,7 @@
 #define DISABLE_X false
 #define DISABLE_Y false
 #define DISABLE_Z false
-//#define DISABLE_I false
+#define DISABLE_I false
 //#define DISABLE_J false
 //#define DISABLE_K false
 //#define DISABLE_U false
@@ -1644,7 +1648,7 @@
 #define INVERT_X_DIR   true  //false
 #define INVERT_Y_DIR   true  //false
 #define INVERT_Z_DIR  false
-//#define INVERT_I_DIR false
+#define INVERT_I_DIR false
 //#define INVERT_J_DIR false
 //#define INVERT_K_DIR false
 //#define INVERT_U_DIR false
@@ -1685,7 +1689,7 @@
 #define X_HOME_DIR -1
 #define Y_HOME_DIR -1
 #define Z_HOME_DIR -1
-//#define I_HOME_DIR -1
+#define I_HOME_DIR -1
 //#define J_HOME_DIR -1
 //#define K_HOME_DIR -1
 //#define U_HOME_DIR -1
@@ -1705,8 +1709,8 @@
 #define X_MAX_POS X_BED_SIZE
 #define Y_MAX_POS Y_BED_SIZE
 #define Z_MAX_POS 1000      //  200
-//#define I_MIN_POS 0
-//#define I_MAX_POS 50
+#define I_MIN_POS 0
+#define I_MAX_POS 50
 //#define J_MIN_POS 0
 //#define J_MAX_POS 50
 //#define K_MIN_POS 0
@@ -2099,7 +2103,7 @@
 #endif
 
 // Homing speeds (linear=mm/min, rotational=°/min)
-#define HOMING_FEEDRATE_MM_M { (50*60), (50*60), (50*60) }
+#define HOMING_FEEDRATE_MM_M { (50*60), (50*60), (50*60), (50*60) }
 
 // Validate that endstops are triggered on homing moves
 #define VALIDATE_HOMING_ENDSTOPS
diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index b3ba8f4919..fae97494b5 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -877,8 +877,8 @@
 
 //#define SENSORLESS_BACKOFF_MM  { 2, 2, 0 }  // (linear=mm, rotational=°) Backoff from endstops before sensorless homing
 
-#define HOMING_BUMP_MM      { 5, 5, 2 }       // (linear=mm, rotational=°) Backoff from endstops after first bump
-#define HOMING_BUMP_DIVISOR { 2, 2, 4 }       // Re-Bump Speed Divisor (Divides the Homing Feedrate)
+#define HOMING_BUMP_MM      { 5, 5, 2, 2 }       // (linear=mm, rotational=°) Backoff from endstops after first bump
+#define HOMING_BUMP_DIVISOR { 2, 2, 4, 4 }       // Re-Bump Speed Divisor (Divides the Homing Feedrate)
 
 //#define HOMING_BACKOFF_POST_MM { 2, 2, 2 }  // (linear=mm, rotational=°) Backoff from endstops after homing
 //#define XY_COUNTERPART_BACKOFF_MM 0         // (mm) Backoff X after homing Y, and vice-versa
@@ -1095,7 +1095,7 @@
   //#define SHAPING_MENU                // Add a menu to the LCD to set shaping parameters.
 #endif
 
-#define AXIS_RELATIVE_MODES { false, false, false, false }
+#define AXIS_RELATIVE_MODES { false, false, false, false, false }
 
 // Add a Duplicate option for well-separated conjoined nozzles
 //#define MULTI_NOZZLE_DUPLICATION
@@ -1345,7 +1345,7 @@
 // @section lcd
 
 #if HAS_MANUAL_MOVE_MENU
-  #define MANUAL_FEEDRATE { 50*60, 50*60, 4*60, 2*60 } // (mm/min) Feedrates for manual moves along X, Y, Z, E from panel
+  #define MANUAL_FEEDRATE { 50*60, 50*60, 4*60, 2*60, 2*60 } // (mm/min) Feedrates for manual moves along X, Y, Z, E from panel
   #define FINE_MANUAL_MOVE 0.025    // (mm) Smallest manual move (< 0.1mm) applying to Z on most machines
   #if IS_ULTIPANEL
     #define MANUAL_E_MOVES_RELATIVE // Display extruder move distance rather than "position"

Note adding these to your config
#define X_STOP_PIN 3
#define Y_STOP_PIN 14
#define Z_STOP_PIN 18

means you do not have to edit the pins_RAMPS.h file to free up the max endstop pins



I do not understand what you mean by "with 2 hotend loops"
you cannot have two hotends on a single extruder, this is not a standard option, It would require a lot of changes to implement this

Edited 4 time(s). Last edit at 02/03/2024 02:56AM by Dust.

Hello,

It work perfectly, thank you.

Right now I have XYZE0U working perfectly. Thank you.

I understand what you advise me that hotend can not exist without the extruder - ok that.

Again, thank you very much for your help.

Edited 1 time(s). Last edit at 02/05/2024 12:57AM by lukaari.