@Ohmarinus, as per your request, tho I don't think there's much to learn from, as I never really figured out the "why"
so the original question was that
STEPS_PER_UNIT calculated from the 1.1.9 calculations are different from stock 1.0.0 configurations provided by my OEM
stock configuration was
DEFAULT_AXIS_STEPS_PER_UNIT { 160, 160, 160, 200 };
whereas 1.1.9 calculates
DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 80, 760*1.1 };
and I previously claimed that even tho XYZ values are halved, movement doesn't seems to be affect, while extrusion is 3 times more than it should be.
turns out I had EEPROM_SETTINGS turned on, so I must have written 160,160,160,760*1.1 into eeprom at some point and the firmware was reading those values.
After clearing the eeprom with settings from the fw, movement is indeed halved
The solution was to use the values the OEM used, I'm guessing the stepper motor pitch is 0.9 and not the more common 1.8, so I changed the steps per rotation to 400 instead of 200 (tho I searched up the model number [17pm-ka39bn03cn] of the stepper motor, and the spec sheet says it's a 1.8 degree motor.... or maybe the mks 1.3 board I have is somehow special and have 32 microsteps instead of the standard 16)
#define XYZ_FULL_STEPS_PER_ROTATION 400
the other question was why the extruder is set to 760*1.1 instead of just 836.
The TLDR:
There's no problem, just a blunder on my part.
Although I've never really figured out the reason for the discrepancy between what i think the value should be vs what the value actually needs to be, the fw seems to be working fine.
Edited 6 time(s). Last edit at 06/20/2019 10:43PM by evo85210.
