I designed this model after finding no good rubber band planes. It's simple and should only take 24 minutes. After printing, clean up the support material on the propeller with a pair of pliers. Then, sand down the shaft and put it in the main body. Insert a rubber band using a paper clip into the propeller. Then take the propeller and put it through the main body. Take the rubber band and put it on the end hook. Then wind it up and enjoy!

Settings:

0.23mm layer height

15% infill

Supports: On

Brims: doesn't matter

Filament: PET-G or PLA

Note: add a drop of oil for extra smoothness:-)