This is a small and mostly effective cat Elizabethan collar or e-collar. This can be scaled to your printer but on a basic 256x256 print plate it's still fairly small. A real collar is probably in order if your cat has more trying injuries.
It kept my cat from pawing at the ointment I put on his head after he lost a brawl. It also made him switch into a “Imma stare at you angry like” mode.
The center neck hole has a diameter of 70mm.