Raspberry PI 3 and 2 case.
The design consideration is for simplicity. The board slide into case from one end. A friction cover then tightly closes it, but leave space to access the SD card.
Print the case standing up, then you do not need support
Update 2 - 2016-12-04
Added case ventilation with holes on top
Update 3 - 2017-02-08
Increase spacing around USB ports for easier fit