Protect hardware from autoleveling sensor malfunction - keep Z-min endstop 2 mm below print surface
There are occasional reports that sometimes inductive or capacitive sensors used for bed autoleveling are failing to trigger and nozzle crashes into glass/bed and stepmotors get damaged.
Is it possible to connect the sensor to some digital pin other than Z-min and on the same time to keep Z-min endstop? Z-min endstop will be set 2 mm below the printing surface level. So if sensor fails than nozzle pushes the bed and Z-min endstop triggers and stops further move down of the nozzle.
Does anybody have experience setting this? Could you share your hardware/firmware configuration?
I'm now installing NPN NO capacitive sensor (LJC18A3-H-Z/BX) on Prusa I3 from Sunhokey with Repetier host & firmware, obviously.