Summary I have been working on this projects for a couple of days. 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, what made the challenge much harder need improvement: Top cross brace has to be lock in place. change connection type. Finger swing range ; push connection between finger and wheel. Gears are a customized version of http://www.thingiverse.com/thing:41246