Algodoo

Simple spirograph machine using two gears, a spring, two force vectors and a tracer.

Notes:
- Minor skips and hops might be solved by further spring & force calibration.
- Clearing the tracer gives you a new sheet of paper.
- The possibilities are infinite
* Move the tracer to different points on the secondary gear.
* Change the gear shape entirely for a new graph set.

Remarks:
- Some improvement upon the basic mechanic would be cool -- but this serves as a decent proof of concept.