Air Raid Siren - hand crank version

There's a newer version of this design:
Air Raid Siren - hand crank version 2


This is an old design! Printers and slicers had other tolerances back then. I have many users complaining in the comments. So be aware of that.

 

This design is 100% 3D printed. Works fine but may have friction trouble when rotating fast!

 

Be careful when using it! Dont touch the moving parts while they are rotating!