This is an arcade machine coin slot that I plan on using in my future table-top arcade machine build. It is designed to fit US Quarters.

I noticed after printing that the coin return slot isn't big enough for a quarter to fit through... However, since I intended for it to be decorative rather than functional, between you and me let's just say it was a feature and not a bug ;) Probably won't update it unless it gets a lot of attention. The coin insert slot works fine though!