Programmable beat machine without electronics

thingiverse

You just composed a chart-topping hit, but now you're stuck because the drummer's on holiday. Don't bother trying to track him down - instead, use 3D printing to create a replacement drummer. Two drumsticks are controlled by two wheels with a customizable number of teeth. By designing alternative wheels, you can program the rhythm to your liking. The wheels can be easily printed out using an STL file that's included in the package. If you're feeling handy, you can even use the OpenSCAD file to print your own customized wheels. By adjusting the voltage on the miniature geared DC motor, you can change the frequency of the beat.