Hello everyone,
I would need some help understanding how Bed Dimensions and home offset are working in Marlin. I am using version 2.0.x on Creality Ender 3 (physical bed size is 235x235mm).
I followed
Method 2 (EEPROM) in
this manual:
1)in Configuration.h is the following:
// The size of the printable area
#define X_BED_SIZE 235
#define Y_BED_SIZE 235
// Travel limits (mm) after homing, corresponding to endstop positions.
#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define X_MAX_POS X_BED_SIZE
#define Y_MAX_POS Y_BED_SIZE
#define Z_MAX_POS 250
2) after flashing the new firmware, manually I set the nozzle to what should be X,Y (0,0) and I used store home offset command via GUI (M500 probably)
3) Now when I check M503 via pronterface I get this:
Connecting...
Printer is now online.
>>> M503
SENDING:M503
echo:;blabla skip
echo:; Home offset:
echo: M206 X-3.70 Y-14.60 Z0.00
echo:blabla skip
echo:; Z-Probe Offset:
echo: M851 X-46.10 Y-6.60 Z-3.80 ; (mm)
That looks ok -> X-3.70 Y-14.60 Z0.00 is indeed what I did set in step 2)
Now to the "issue": even though I set bed size 235x235 I can't move nozzle more than X 231.30 Y 220.40 (Software endpoint) and therefore I can't use whole bed to print. Marlin does not allow nozzle to move more than {X,Y}_MAX_POS from home, but
I would expect it should allow nozzle to be moved to Cartesian coordinates {X,Y}_MAX_POS instead, where (0,0) corresponds to corner of printing bed and home offset (a,b) is stored in EEPROM. Does anyone have idea where I should start checking and rewriting the firmware to allow such a behavior?
Edited 2 time(s). Last edit at 12/11/2021 03:03PM by nopainogainopainogain.
