Printable Robot Arm - Forearm

This is the forearm for my robot arm project.
http://youtu.be/JUvv04BSIvo

This is a first try, and work in progress. Don't expect a fully functional thing.

The metal gears have 20 and 40 teeth and a Modul 0.5.

This is a add on for my printable "Robot Arm"
http://www.thingiverse.com/thing:591230

I started a hackaday project:
http://hackaday.io/project/3800-3d-printable-robot-arm

You can find a overview on my blog:
http://chaozlabs.blogspot.de/2015/01/3d-printable-robot-arm.html