Slim Press-Fit Raspberry Pi Cases

These are a set of press-fit cases for Raspberry Pis with a very slim profile.

For each Pi model, there's a bottom and two tops. One top has openings for the I/O pins; the other does not. The variant with I/O holes is slightly shorter. The Raspberry Pi Zero has a third top for boards that don't have any I/O pins attached.

There are cases for the:

* Raspberry Pi 4B
* Raspberry Pi 3B+
* Raspberry Pi 1B+, 2B, and 3B (the same case fits all three models)
* Raspberry Pi 1B
* Raspberry Pi Zero, Zero W, and Zero 2 W (the same case fits all models)

The models are designed in OpenSCAD; the source files are at https://codeberg.org/asciipip/slim-raspberry-pi-case.