Thingiverse user StreetPiet has created this awesome simple arcade coin slot, and you can 3D Print this out now too!
This is a simple Coin Slot for a Arcade Machine Fun Project of mine. It works for Euro Coins from 50 Cent up to 2 Euro. I added the FreeCAD File so everyone interested can customize it. The thickness of the boards of my Cabinet is around 30mm but it should work for thinner boards too. –StreetPiet