This uses 2 7-8mm M4 SHCS bolts, slightly shorter than the ones included in the Exoslide Ender 3 Y carriage kit. With this, you can get rid of the microswitch and use sensorless homing on the Y carriage. It looks cleaner than just leaving an unplugged microswitch there. Also less wires :)

Print material does not matter, I used ABS-GF because it's what I had loaded. You can use PLA for this.

5 walls, 5 top/bottom, 20% gyroid infill. Do not rotate. Does not need supports, model has sacrificial layers that need to be removed after printing.