A case for the "Commodore 64 PS/2 mouse to 1351 mouse adapter" from Melbourne Console Reproduction (melbourneconsolerepros.com).
The case is a really good fit and really strong. Screws are not needed, just click the top over the bottom of the case.
A second joystick does fit without a problem.
Update: An update of the case is added (Case6_V2). It is 25% lighter, easier to assemble/disassemble and a faster and easier print with almost no infill. The PS/2 side of the bottom is slightly improved for a better fit. The outside of the case is the same.
If you are a "build like tank"-type, choose version 1, for all others choose version 2.
Happy retro-computing :)
Rafts:
No
Supports:
No
Resolution:
0.2
Infill:
doesn't matter,
Filament:
Real/PM PLA
None