Bicycle Propeller

A catchy propeller for your bicycle. for you or your kids. It starts rotation as soon as you have a minor speed.
This is a re-implementation of https://www.thingiverse.com/thing:6595868
I remade it with following changes:
- Added an outer ring for robustness
- Replaced the shaft with a M5x50 countersunk screw
- Increased the blade angles (in the hope for more rotation benefit.

You will need:
- 1 M5x50 countersunk screw
- 3 M5 nuts

Depending how you print the shaft, the hole will be too tight. I use a 5 mm drill to widen it so the screw can easily be pushed in.
The first 2 nuts are locked against each other to have a fixed play to the propeller. The 2nd of those nuts gets pushed into the holder. And the last nut locks the screw to the holder.