Standard camera hot shoe cover.
Some cameras like my Nikon D850 and D750 do not come with a hot shoe cover, and the original manufacturer part is around 10 bucks each - for a tiny piece of f-ing plastic.
I know there are numerous other hot shoe cover designs out there. But when I designed my hot shoe picatinny rail mount, I already had to design the hot shoe cover part, so I kind of got this as an unintended extra.
Default settings and standard nozzle will do. Model was designed for 0.2mm layer height and 0.4mm nozzle. Using different nozzle diameters and layer heights = YMMV.
This can of course also be printed with PETG or PLA, but I printed mine with Polycarbonate (PolyMax PC).
The author hasn't provided the model origin yet.