Click
， nozzle would fall until
the end-stop close, now there might
be certain distance between the
nozzle and the hotbed , then we
adjust the end-stop down in small
distance every time, after every
adjustment, press
, until the
name card can move but you can feel
the resistance, then the calibration is
OK, tighten the screw of Z end-stop
PS: the criteria of the height between
nozzle and hot bed is that the first
layer just be flattened.
