Designed to hold two switches and a potentiometer, the switch holes are 12mm diameter and 8mm for the potentiometer hole.
The switches can be used to break the power connection or for lights, the potentiometer can be used to control fans outside of the program.
The size of the switch box is 80mm x 30mm x 38mm, this will allow optimal space for large switches and for cable management, there is a round opening (12mm) to allow for cables to be passed through if it be sheathed or single cables.
Mounting of the switch box can be achieved by using M4 bolts/screws (x2) via the two tabs located on the side of the box.
I would suggest using supports for the tabs due to the overhang, everything else should be fine to print in the current face down orientation. You may chose to add further supports for the side opening.