2-ch 2-gear Programmable Percussion & Rhythm Machine

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Yes, even this design can be downloaded for free once I am fully funded for my RoboGuts S.T.E.A.M. Education Program Kits; if each viewer donates just $5, I'll be funded almost overnight and then all my designs become downloadable for free! The fastest way to get all my .STL files is to donate $5 to help fund school materials... once I have $3,500, I'll convert all these files to downloadable for free. This is an upgraded kit from the more basic kit I uploaded earlier... this includes differential gearing so one drum drives the other at a different speed to create more beats and allow for more syncopation; yes, every part here is designed to be printed with a MakerBot CupCake MakerBot, except for the rubber band. Get those from your local post office! This is another entry to the makezine.com go/makerbot contest... blog.makezine.com/archive/2010/04/makerbot_giveaway.html Instructions: Use the BOM to see how many of each part to print with MakerBot, and both the drawing and display images to assemble your 2-ch 2-gear Programmable Percussion & Rhythm Machine. Rubber bands are the springs around the horizontal extensions out to the hammer pulls the hammer back to a stand-up position. Program the drum set by sticking the programming pegs into the holes on the drum... set different objects in front of the hammers and crank the machine to hear the rhythm you created... it's a learning process to understand beats/measure; then with 2:1 gearing and a second machine, you can increase the resolution to 32 beats/measure. If you store a few extra programming pins inside the drums, you'll have two more sources for noise... albeit not percussive but more like a rattle. Adding a servo drive to the back will allow for continuous rotations; adding a microcontroller will allow you to vary timing turning the motor drive on/off and at different times... there's almost no end to the expandability of this kit! If you successfully make this with a 3D printer, please send me the build-file and machine type so it can be uploaded here for others to use.