Arcade Coin Reject Flap
thingiverse
There are various styles of coin reject flaps. The one I found on thingiverse didn't work for my Area 51 Site 4, so I modeled my own. This works great for me, and has a bit of reinforcement on the arms to hopefully strengthen them (my original had a broken arm). The reinforcement doesn't interfere with operation. I printed at 10% infill, but I used a support blocker in cura to make infill of the arm region 100%. You could print the whole thing at 100% if you don't want to deal with support blockers, but either way, I highly recommend making sure the arm region is 100% infill since that's what would be prone to breaking through abuse.
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