About this 3D model

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 and push the coin mech open. 3: Switches. At the back of each coin chute should be a mounting point for a switch. 4: Storage. Each denomination of coin should fall into its own coin tube. 5: Rejection of objects larger than a quarter. At the very top of the mech, discs which are larger than a quarter should be automatically rejected. This may just be handled by making the coin slot to the outside of the machine just big enough to take a quarter. 6: Escrow. Not necessary, but it'd be nice if the coins that you have placed in the machine should be held in escrow until you dispense a soda, and returned to you if you press the coin return button. UPDATE 9/16/12: IT VERKS!!! I just got my first test rig printed, and (when I use pretend force instead of actual counterweights) it works! Now all I need to do is add some real counterweights and some switches and we should be in business!