Summary For my hypercube, i am placing my PSU horizontally on the rear. This design has a built in window where you can place a voltmeter using my already made enclosure using a tab of superglue gel http://www.thingiverse.com/thing:2093246 The top opening is for a simple toggle switch such as this https://www.menards.com/main/electrical/light-switches-dimmers-outlets/light-switches/gardner-bender-reg-black-on-off-sp-appliance-rocker-switch/p-1444431000782.htm Hope its useful for you. Print Settings Printer: Hictop Prusa i3 Rafts: No Supports: No Resolution: 0.20 Infill: 60% Notes: Prints without supports if your printer can handle bridging.