This is a case for the UC2 Cartridge Rev.5 and Rev.6, as described here:
https://oe7twj.at/index.php?title=Universal_Cartridge_2
Please make sure your PCB has the correct revision.
Other revisions of the PCB might not fit. I'll publish cases for all revisions here. If you don't find yours, please reach out and I'll work on it.
The hole for the screw will not be left open, but the position will be easy to find.
The reason is that leaving this open will not provide a clean print of this part.
The two shells will also fit without being fixed by a screw. If you prefer screwing it together, you'll need to use threaded inserts.
The author hasn't provided the model origin yet.