Bed does not move up when doing bwd levelling

[xchrisd]

Maybe the z-limit switch gets not unactuated?

Unrealiable Z offset

SOLVED !!! SOLVED !!! The problem was caused by the tongue of the microswitch being bent downward. So the switch was not being activated properly by the limit switch block. The switch did not seem to activate even when pressing the tab with fingers. I solved it by bending up the tab. I would say that this method of handling Z-axis homing is not very reliable because the tongue of this microswitch is made of a very light sheet metal and when the board is lowered it is probably always subject…