Just curious, what needs to be modified in Marlin for it to support homing

3D Printing
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1

Just curious, what needs to be modified in Marlin for it to support homing to max endstops for a CoreXY machine (at least Z-max)?

Currently, homing to max endstops is disabled because of compatibility issues with the endstop checking routine, but I’d prefer if the machine homed to x-min, y-max, and z-max

Thanks in advance,

2

I just did that to my printer! If nobody tells directions here before I reach my laptop, I can post my settings from configuration.h file.

3

Here is those endstop settings in configuration.h what I think effects to this situation. I don’t have XY endstops so please don’t pay attention to their settings.

With these settings my H-bot printer homes Z-axis to the lowest point(max lenght) and with “travel limits after homing” I can adjust the distance between bed and nozzle.

#ifndef ENDSTOPPULLUPS
// fine endstop settings: Individual pullups. will be ignored if ENDSTOPPULLUPS is defined
#define ENDSTOPPULLUP_XMAX
#define ENDSTOPPULLUP_YMAX
#define ENDSTOPPULLUP_ZMAX
#define ENDSTOPPULLUP_XMIN
#define ENDSTOPPULLUP_YMIN
// #define ENDSTOPPULLUP_ZMIN
#endif

#ifdef ENDSTOPPULLUPS
#define ENDSTOPPULLUP_XMAX
#define ENDSTOPPULLUP_YMAX
#define ENDSTOPPULLUP_ZMAX
#define ENDSTOPPULLUP_XMIN
#define ENDSTOPPULLUP_YMIN
#define ENDSTOPPULLUP_ZMIN
#endif

#define INVERT_X_DIR true // for Mendel set to false, for Orca set to true
#define INVERT_Y_DIR true // for Mendel set to true, for Orca set to false
#define INVERT_Z_DIR true // for Mendel set to false, for Orca set to true
#define INVERT_E0_DIR false // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E1_DIR false // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E2_DIR false // for direct drive extruder v9 set to true, for geared extruder set to false

// ENDSTOP SETTINGS:
// Sets direction of endstops when homing; 1=MAX, -1=MIN
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR 1

// Travel limits after homing
#define X_MAX_POS 220
#define X_MIN_POS 0
#define Y_MAX_POS 220
#define Y_MIN_POS 0
#define Z_MAX_POS 177.03
#define Z_MIN_POS 0

4

@Topias_Korpi , Thanks for the help; I got the printer to home to Z-max successfully, XY max is not too critical

5

Glad to help you!