I have a custom Cartesian style 3D printer. The controller board has been upgraded to a BIGTREETECH SKR V 1.4 Turbo. This is a 32 bit board.
Marlin 2.0.3 seemed to build and install with less issues than others. I'm using VS code to work with Marlin. My big problem is with homing all axis. For some reason the Z axis finishes with the extruder 6 mm above the bed. The extruder goes below the bed to start printing. It's damaging the bed. What can be done in Marlin 2.0.3 to fix it?
For some reason the Z axis finishes homing with the extruder 6 mm above the bed.
If homing Z axes seems proper - i.e. nozzle is "touching" the bed during proces, and not going below the bed level) - then homing may be correct. Otherwise do troubleshooting, as has been suggested in comments. Check also the offset and backoff settings. All these should allow to explain these 6 mm.
The extruder goes below the bed to start printing.
Follow this checklist about starting point to find out any other reasons which could come into play when printing starts.
