This is a casing for a custom-made PCB converting the 5V circuits of two 80s-style digital joysticks to the 3.3V GPIO circuit of a Raspberry Pi. Obviously, it houses as well the two DB9 connectors needed to plug in the joysticks.

The photo has a slightly older version of this model with some minor design issues that are corrected meanwhile. I removed to Atari and Commodore logos you can see on the photo from the model to avoid potential trademark issues. The source code does contain the reference to the logo files and the latter ones can be found on Wikipedia if you feel that you need them.

I printed the model with PETG and 0.2 mm layer height without supports, which caused a bit of stringing on the fine hexagonal grid. In the newer version of the model, I rotated the grid though since I expect to get slightly better results then, though I have not yet tested this myself. Printing with PLA instead might improve the situation here as well a bit.