Arm for Arduino 3d printed modular tank chassis

An arm module for the http://www.thingiverse.com/thing:571461 .
The files are for the base of the arm that is attached to the chassis and the arm that holder the gripper.
The gripper is not my design obviously!
I used the mini servo gripper design http://www.thingiverse.com/thing:2415 .
Mini 9g servos are used for the movements ( they are really cheap on ebay!).