"Total" Remix for different switch from: jjbun's http://www.thingiverse.com/thing:520154 Y-Endstop for 8mm rods (20mm space between the rods). 3mm holes. I use in the photo jujst wood or plastic screws. On my Prusa i3 the bed goes on 70mm high from the desk and one end of the aluminium frame 53mm (photo). Perhaps can differ 3mm. So, the switch hits to bed frame end or PCB edge optionally. Printed: ABS, 40mm/s, 20% infill only, but came out very tough.