I needed a bunch of rear lens caps for Fuji X-Mount lenses when I picked up some lens adapters for my old M42 and Olympus manual primes. Rather than buy a 3rd party set off eBay (or pay Fuji's ridiculous prices!), I thought I'd spin up a replacement in OpenSCAD and try printing them.
They are based on similar dimensions to the official caps, and I designed it with grip notches to give it similar ergonomics to the injection molded original.