One part fan / turbine with gearing

https://youtu.be/1vxDJefhkyk

This is a one part fan. maybe some parts will change with more iterations.
It must be printed without Support.
I printed it with 0.2mm layer and 0.05mm. The 0.2 mm layer worked better, but I will test many more.

You must Level your printbed pretty accurate, otherwise the gears will not turn.
The tolerances depend on your machine set up, so I can not guarantee that it will work on every 3D printer.

I did not try to print the keychain version yet. Mayb