Printable Coin Mech 0.2

For a long time now, I've wanted to make a DIY pop machine. Now that I have access to cheap and rapid prototyping, it's time to revisit that project, and see if I can print a coin mech and a mechanism to dispense cans of soda, and wire all that up with an arduino and put it inside a wooden box.

Toward that end, here's my first pass at a printable coin mech, based on this video:
http://www.youtube.com/watch?v=85C4eh0mEJg

If you want to hack with me, the repo is here:
https://github.com/iworkinpixels/Printable-Coin-Mech

TODO:
1: Coin return. The cradles need to be on a hinge, and a coin return lever needs to open up the coin mech when pushed. This is especially important because if the mech rejects a slug, it will usually do so by getting stuck in the mech. We need a way for the next user to clear the mech, or this is a clear DoS attack vector. :)

2: Failsafe. If the machine is off, a lever which is normally held out of the way by an electromagnet should be released a