Gear backlash explained. Addidionally needed: M5x10 bolts 3pcs M5x15 bolt 1pcs small rubber ring Optional: I used 4 magnets inserted in holder object during printing at 5.4mm layer height. Holes are designed for magnet dimensions: 5x5x5 mm cube. So it can be mounted to some metallic surface. Licence: https://creativecommons.org/licenses/by-nc/4.0/