Retro Cotton Reel Tank

thingiverse

This is 3D printed version toy that was originally made from wooden cotton reel, rubber band, piece of candle and stick. You will need printed parts, rubber band and stick. All put together as seen on pictures. Because the 3D print is smooth, you will probably need to sand a bit the parts, where the friction is. Or you can use piece of candle - that makes the tank go more slowly. The key is balance between rubber tension and friction of parts.