I made my printer to have a left handed coordinate system (it homes to the back left corner of the heatbed), I did this because it happens to make working on the printer easier for me. This, however, causes the objects to be printed mirrored. In Slic3r I manually mirror objects every time I load a new objects. From time to time I forget doing this which is really annoying. I was wondering if there is a setting in Slic3r to automatically do this. Something like mirroring on import, or changing the axis in Slic3r itself.

  • $\begingroup$ So your Y min end stop is at the front of the printer when facing it and left for X min? I think you can fix your problem using the correct setup in your configuration of the firmware. $\endgroup$
    – 0scar
    Apr 26 '18 at 7:01
  • $\begingroup$ @0scar yes its in front $\endgroup$ Apr 26 '18 at 10:38

The direction of the end stop is set in the firmware of the printer. Even with different setup end stops, you should be able to get a correct coordinate system without mirroring axes in slicers. This would be the preferred method to fix your problem!

E.g. my Ultimaker 3 Extended homes the Z on Z max having the platform at the bottom of the machine, a calibrated offset determines the actual Z=0.

Not knowing which firmware you are using, in e.g. Marlin Firmware this is set by code lines in the file Configuration.h:

// Direction of endstops when homing; 1=MAX, -1=MIN
// :[-1,1]
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1

Your end stop triggers at the maximum of the Y axis, so you need to configure it as a MAX end stop, i.e. use the Y_MAX pins by defining (search for the Endstop Settings section, note to also disable the YMIN endstop):

//#define USE_YMIN_PLUG // This disables the YMIN endstop
#define USE_YMAX_PLUG   // This enables the YMAX endstop

and change the homing direction (Y_HOME_DIR) to 1:

#define Y_HOME_DIR 1 // This tells the printer where the endstop is located: positive for YMAX direction

Otherwise when used at Y_MIN endstop and the homing direction set to -1, the axis is reversed as you experienced.

  • $\begingroup$ with "adjust the bed coordinates underneath" you mean #define Y_MIN_POS and #define Y_MAX_POS ? $\endgroup$ Apr 26 '18 at 10:38
  • $\begingroup$ its ok, I managed to mirror the axis, I set #define Y_HOME_DIR 1 and in addition: #define USE_YMAX_PLUG #if DISABLED(ENDSTOPPULLUPS) #define ENDSTOPPULLUP_YMAX #define Y_MAX_ENDSTOP_INVERTING true and I inverted/removed all Y_MIN settings, which made everything work. ty $\endgroup$ Apr 28 '18 at 19:56

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.