Prusa Box Enclosure - Coupler for 3 round switches

I modified the middle coupler to be able to fit 3 round switches, type R13-508 / R16-503 or similar.

Check the gcode for printing orientation, it should be on the side, no supports needed.

I've made 2 versions of the model:
- one with holes diameter 15.8 mm (tight fit)
- one with holes diameter 16 mm (loose fit)

You can print one or both of the fit testers to decide on which one should you print.

Check the photos to see a drawing for the clearance below the switches (the numbers are displayed in millimeters). If you place the switches according the drawing (the connectors are not centered), there should be enough space for the cabling.