Adjustable Z Endstop for Folgertech Prusa i3 2020 X-Axis Upgrade

This is one of the X-carriage rail mounts with an added hole to accept an M3 screw. I used a screw about 30mm long and glued the thumb knob part to the head to allow for a more fine tuned adjustment of the z endstop.

I also added in some supports in the rail opening to help out the bridging.

Fairly simple addition, everything else is sonnylowe's design.