UPDATE: This is the old version. Fewer parts. The newer version with more parts (so you can print in more colors) with added detail, is here: http://www.thingiverse.com/thing:137729
I left this one up, though, in case you prefer it.
This was a test. I love the game Robo Rally and I wanted to make my own tokens in multi-color print using an Afinia H479 printer. I wasn't sure how small I could get.
This guy printed pretty small, and with good detail.
The treads snap on nicely, so they can be printed in a different color.
The lower arms snap into the upper arms.
The neck snaps into the body and the head.
The arms, however, will need gluing. They shoulder ball sits in the socket, but not to hold. Gluing will be necessary. But the ball allows you to glue the arms at any angle you like.
Note: The detail is low on this model, but it's a work in progress.
Note 2: The upper arms and lower left and right arms are practically identical. You can probably just print two of the same upper and lower. That would work.