Percussion Machine

The idea is to build a percussion machine where you can create customized rhythms. The three different sized blocks provide different pitch when stroked while the twelve holes inside the spinning wheel controls the timing of each strike. There are more than 1700 possible combinations.
The hole design is made from 9 pieces, and fits in a 10x10x10cm box.

Proof of concept model. Never have been test, but Fusion360 file included.