PS: You could also check point 4) (ball screw coupler) as described in this FAQ document. If the Z axis’ ball screw coupler slips, this could be an error that could appear under load and not when milling air.
PS: You could also check point 4) (ball screw coupler) as described in this FAQ document. If the Z axis’ ball screw coupler slips, this could be an error that could appear under load and not when milling air.