Air Raid Siren - hand crank version 2

cults3d

Remix of my own design. A lot of positive response led me to redesign it, incorporating metal bearings to eliminate friction problems that plagued the 100% 3D printed version. It now runs much smoother! To build this, you'll need these metric [mm] bearings: 1 x 47/25/12 - SKF 6005-2Z 4 x 16/5/5 - SKF 625-2Z I also experimented with designing it for 3D printed bearings, but they didn't work well. I was able to find these bearings in an industrial store near my town for around 35 €. They're standard sizes, so you should be able to get them easily. Videos: I uploaded two clips to YouTube: Printing Timelapse: https://www.youtube.com/watch?v=VzprH9Nd3co Assembly and Test: https://www.youtube.com/watch?v=xtA24MJphcA Slicer note: I used Simplify3D to slice all parts. If you print it with MakerWare, the parts might not fit together - I discovered that MakerWare doesn't account for nozzle size. That's why I had some space between each part on my preview version featured on Thingiverse. I'm not sure how Cura and other slicers work, so test it with small parts like GetrRad2A and GetrRad2B before printing larger parts - they should fit together very tightly. If you own a Makerbot Replicator but don't have Simplify3D, I've included a .zip archive containing all sliced .x3g-files ready to print. There's also a README.txt if you encounter problems getting the bigger parts printed on your R2. Designing: I use basic AutoCAD for drawing my 3D stuff because I use it frequently at work. It took me about 200 hours to design this siren. I've added the drawing file if you want to make changes.