Hi Canaylan
It's probably because you have the EEPROM enabled. You can change DEFAULT_AXIS_STEPS_PER_UNIT and MANUAL_Z_HOME_POS without uploading Marlin using gcode commands.
M92 Xnn.n Ynn.n Znn.n Enn.n for the steps per mm and M666 Hnnn.nn for the Z height (in the Rich Cattell version) then send M500 to save to EEPROM. If you send M666 L the machine will list all the available M666 options and the current values. M501 will list all EEPROM current values. If you want to revert to the latest Marlin upload values then M502 will put those into the machine and M500 will put them into EEPROM overwriting the current EEPROM values.
Regards
Andy
It's probably because you have the EEPROM enabled. You can change DEFAULT_AXIS_STEPS_PER_UNIT and MANUAL_Z_HOME_POS without uploading Marlin using gcode commands.
M92 Xnn.n Ynn.n Znn.n Enn.n for the steps per mm and M666 Hnnn.nn for the Z height (in the Rich Cattell version) then send M500 to save to EEPROM. If you send M666 L the machine will list all the available M666 options and the current values. M501 will list all EEPROM current values. If you want to revert to the latest Marlin upload values then M502 will put those into the machine and M500 will put them into EEPROM overwriting the current EEPROM values.
Regards
Andy