Hypotrochoidal fun

Just for fun I decided to make a simplified spirograph on the wire. The gears are 32 DP and have tooth ranges from 16 to 80 teeth. I have one or two more gears I am going to make for it but it is basically done. The gears run with the ring gear creating hypotrochoidal curves (or epitrochoidal if two externals are used). The tiny gear has one large hole because I wasn't sure what size to make them and I decided later to make the remaining holes smaller so the pen holds the gear better.

I may do something with the edges of the ring gear piece at some point also.