Raspberry Pi 3 (B/B+) case with rack option

Remix of 0110-M-Ps design https://www.thingiverse.com/thing:922740

I added the option to rack the cases.
Holes on Vesa mount are increased to 5mm.

You need to print top & bottom if you want to rack Raspberries because of the increased Vesa holes.

You need 4 spacers, obviously ...