UPDATE: Top part with Volt markings added. For using an old ATX power supply with standard 4mm banana plug sockets. Incorporates four sockets that provide: GND 3,3V 5,0V 12V I wanted it to print quickly, so I didn't space the holes correcly and made no room for an extra on/off switch. The SketchUp file is provided, so you can make changes if you like. The part needs six M3x10 screws, two for the top part, and four for the base. I recommend printing the top part and the base separately, the base part having a raft to stick better to the printbed.