This is an auto bed-level mount for the extruder that comes with the i3 Rework parts. It can be printed without supports. This was made on Tinkercad. You can copy and edit it here: https://tinkercad.com/things/dsifjfE9IBQ-auto-bed-level-v3/The mount is attached to the extruder by means of the 2 M3 screws that hold the hotend in place, and has a place to mount the M3 nuts so it's easy to detach if needed. The Z-probe is somewhat generic. It allows you to insert a servo-head into it and glue it with epoxy, but I'll improve on it soon. The servo is a generic micro servo. In my case, I have Saintsmart endstops (PCB) so I de-soldered the actual endstop from it and wired a bigger one which I mounted on the z-probe. Then, I mounted the PCB to the top of the support. This way, I have the LED available for calibration.