1:3400 Reduction Gear

Hello!

This is an improved version of the reduction gear set I uploaded before: https://www.thingiverse.com/thing:2986485

The improvements in comparison:

* I used 3mm-high gears instead of 5mm (for large ones), and 7mm-high gears instead of 10mm for small ones. This gave me the space to add more layers in the same height.
* I used better support for the metal rods, so they don't keep moving (it was too tight in this final version, I had to use a hammer to push the structure on the rod, which broke the top structure as you can see in the video/picture).
* I used snap-on lego-like design so that the layers can be installed on the each other without glue (worked for the right part of the structure, did not work for the motor box part).

You can see the gear set working video here: https://youtu.be/YVHOVN4OEyU

Some after-thoughts:

* I think the thickness I use when I design maye be lower than my 3D printer can handle (MonoPrice Select Mini v2). I design a 2mm-high layer