This is a shelf for the Razer Wolverine Ultimate Xbox Controller. 

It's designed to be mounted to a wall with two screws. I used 3 mm diameter screws but the slots are 4 mm wide if you only have those but some sanding might be required. The head of the screw can be a maximum of 7 mm diamter and a depth of 3 mm.

 I printed this with PLA at 0.2 layer height with 15% infill and no support. The screw-slot is domed for easier printing.