Use the BOM to see how many of each part to 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 2nd machine you can increase the resolution to 32 beats/measure.


BTW, if you store a few extra programming pins inside the drums and you'll have a two more sources for noise ... albeit not percussive but more like a rattles.


Adding a servo drive to the back will allow for continuous rotations. Adding a µController will allow you to vary timing turning the motor drive ON/OFF and 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.