Remixed this to reduce the size just a little to more comfortably fit on my small print bed. I also removed the screw holes and made the backplate larger to be compatible with 3M wall mount strips. Lastly I adjusted the bottom so that it can sit flat on the print bed and avoid any overhangs so supports aren't needed. The holes don't really serve a purpose other than to reduce material costs, but I suppose you could stick a pen in there, or hang something off it if you so desired.

Mine holds the Xbox One, Xbox 360, PS4 and Switch controllers (when in the clicky square thing that holds the two joycons together) I imagine it would home pretty much any controller that conforms to the roughly standard "controller" shape.