I wanted to replace the coin mechanisms/comparators in my pinball machines to accept tokens, so I took measurements of a Suzo-Happ $0.25 coin mech. I also wanted the option to have it accept or reject all, so I tweaked and reprinted it a few times. The first idea was just two separate versions, then one with a curved key which had bad overhangs. This version needs support only for the bottom pins. The upper alignment pin that goes into the coin door has a support that needs to be broken/trimmed-off. The accept/reject pin needs a #6 x 1/2inch sheet metal screw. (I prefer truss-head stainless-steel, but they aren't common in HD or Lowe's.)

Prusa

Prusa XL

Doesn't Matter

Yes

.25

15

I used "Support on build plate only" to support the two bottom pins. Other than that it should be good to go, printing upright. Use a brim if your build plate doesn't stick well. The accept/reject pin should be printed on its side.