Penning this post after assembling my just arrived SnapMaker.
The issue I am having is with SnapMaker’s behaviour to a ‘Home’ command as issued through the operator panel. Snapmaker travels in the +Z (up) direction, shuffles X and Y then proceeds in the -Z (down) direction to a point where I must switch off power to avoid the printer nozzle attacking the bed.
A similar result occurs when invoking a ‘Calibration’ through the operator panel.
When in jog mode SnapMaker obeys all +/- stepping commands.