Compact 117:1 gearbox

I bought some super cheap DC motors, and it way too fast, at 6v the rpm can be 20.000. So I decide to reduce it down so it can useable.

Parts list
- gear0:1item
- gear1:1item
- gear2:1item
- gear3:1item
- gear4:1item
- base: 1item
- cover: 1item
- column: 3 items
- connector: 4 items
- elastic: 2 items, to create pressure for base & cover stick together, dirty but work :D

Gear 4 will be fit for a 3mm shaft, to transit the force to wheel.

=========== 20-05-2017=================
Please don't print the gear 4 for now, I mistaken the size, it won't match with the gear 3
**Gear4 fixed**