ProMicroHousing

A simple case for small arduino boards. Can be adapted with customizer. The default parameter (and includes stl files) are for a pro micro board (without pin connectors. With pin connectors it would not fit into the slots of the case. But you can adopt all sizes with customizer or directly in the open scad file).
I am using it for an R/C transmitter to USB joystick interface, which I am using for picasim, a free r/c simulator.
The board slides into the case and the cap slides into the case, too. Therefore you do not need screws to close the case. If the gap is aligned to your printer the cap holds without glue.