Links for a caterpillar track

We are designing a robot with a caterpillar track, this is our design.

Thanks to http://www.thingiverse.com/olalla for the half of the work.
Thanks to http://www.thingiverse.com/obijuan for the help and the printer.

The final result is caterpillator: http://www.thingiverse.com/thing:7752