Air Raid Siren - hand crank version 2

Remix of my own design. I had a lot of positive response so i desided to redesign it and use metal bearings to avoid friction problems i had with the 100% 3D printed version. Runs much smoother now! To build this you need these metric [mm] bearings: (amount x outer diameter / inner diameter / height - link) 1 x 47/25/12 - SKF 6005-2Z 4 x 16/5/5 - SKF 625-2Z I also tried to design it with 3d printed bearings - But did not work that well. I could get these bearing in an industrial store