Power Supply Case

Basically its a box with two holes in it for AC in and DC out. Its only the box, not the electronics, you are responsible for that part and for not getting yourself zapped or caught on fire.

I bought a bunch of high-amp 5v caseless power supplies off ebay, and I am building power supplies that can power multiple single board computers at once.

Print the bottom and the top pieces, the bottom piece has a slot at the top and the top piece slides into it. The tolerances are fairly loose as my printer isn't that finely calibrated and for me it fits very nicely.
For me, there were no need for supports, but I can't speak for every printer or scale.