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Yes, even this design can be a FREE download once I am fully funded for my RoboGuts™ S.T.E.A.M. Education Program Kits;
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The fastest and cheapest way to get all my .STL files FREE is to donate $5 to help fund school materials ... once I have $3,500 I'll convert all these files to FREE downloads. https://www.gofundme.com/roboguts-kits-lessons
This is a very expandable system ... it can be multiple channels on a rotating drum with multiple drums with gearing between the vertical and horizontal systems you can add more and more to create a very large array of percussive triggers ... I\'m still tweaking the various different multiple systems. Yes every part here is designed to be makde with a CupCake MakerBotable ... except for the rubber band ... get one from your local post office! I wish I had a MakerBot to actually build and test my creations! This is another of many entries to the makezine.com/go/makerbot contest ... blog.makezine.com/archive/2010/04/makerbot_giveaway.html Instructions See the bill of materials for quantities of each to MakerBot for the 1-Channel PPRM ... then MakerBot the parts and start fitting them together into your new drumming/tapping machine as shown in the diagrams. A rubber band is the spring 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 hammer 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 2nd machine you can increase the resolution to 32 beats/measure. BTW, if you store a few extra programming pins inside the drum you now have a second noise source ... albeit not percussive but more like a rattle. 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.