This version has a rate of reduction 5:1, it was to make more certain, the number teeth of Gear in put is 9, so the size of teeth is larger, easy to print more. 

Please see more link:

 http://www.instructables.com/i...

 https://pinshape.com/items/221...

The following is some changes:

1. Reversing bolt of out put shaft 

2. Gear in put: 9 teeth and add a flatform 3mm

3. Wheel out put has changed

4. Added more an option: cover out put with 2 bearings, if someones wants :)) (bearing for shaft out put)

Other details are not changed from the previous version and of Janth (thanks Janth).

All . Stl files  are checked with Netfabb.