How do you change/save updated Z offset without calibrating?

[brent113]

@nivekmai

I’m curious if may be @Edwin could answer if G1029 D is what the touchscreen is doing when you dial the z offset outside calibration?

It’s not, it uses another method tied into the HMI handling process. It doesn’t use gcode at all, the touchscreen has a special z offset variable.

Snapmaker/Snapmaker2-Controller/blob/97caac454fbeab387900077243a8b77707844b0e/snapmaker/src/service/bed_level.cpp#L370

G1029 D directly modifies the z_values[i][j] store containing the mesh offsets, in abl.cpp via the compensate_offset function

BedLevelService::UpdateLiveZOffset is dispatched from SystemService::ChangeRuntimeEnv, which itself is an event callback registered to the touchscreen and handled by DispatchEvent called in the main system loop.