This is a case for the cheap volt amp meters with binding posts or banana jacks, I initially made it with no angle but realized you can't see the values when you put it on the desk.

I used a usb cable to power it and passed it through the back hole, I also used shrinking tubes to avoid any shorts.

Depending on how you print it you might have a problem with the cover, I personally had to grind the edges a bit, I know it's not the best design but it works