this is a 3d printable exidy rom-pac case, tested with the original rom-pac and the modern clone at https://github.com/abzman/Exidy-Sorcerer-Stuff

I uploaded it to thingyverse.

install openscad, run make, and print the generated STL files to your heart's content.

the rompac.stl file is not really useful as anything other than a visual fit check or thumbnail.

I printed mine on a flashforge guider 2S with PLA, but be fine with anything

PLA at 215 degrees filament, 70 degree platform with raft, 25% fill. the pin is a bit weak

PETG at 240, platform 70 with shell thickness = 4mm.
this has the pin strong enough.

the shells are held together with the press-fit pin, this might want a little sanding, depending on your printer. if it is loose, tape works. i might put locking tabs on the inside surfaces of the front bevel, if you do this before me, send it to me at curt@zen-room.org.

yeah, it's GPL3. ship it and derived works with buildable source code; if you learned something from this, you must pay that learning forward.