I have been modifying my i3 to allow me to use the Marlin update with auto leveling of the bed. I attached the parts that had to be printed, the servo and the micro-switch, and wired up the micro-switch to the RAMPS board. Since I wanted the protection of an endstop switch to prevent the extruder crashing into the printer plate, I kept the original Z-axis endstop switch.

I wanted to print something before I had the chance to upgrade the Marlin firmware, but I found that the original end stop switch would not stop the movement of the Z axis until I cut the connection between the Z probe switch and the RAMPS board. Here is a sketch of how these switches were wired up:

Z-Stop Switches.jpg

Have I wired the two switches correctly? If this is the correct way to wire them up, then I have forgotten to set the trigger rod correctly, and that is not an electronics problem.

Old Man Emu