Yes there is some important things missing from this design, specifically the two holes where the pin goes to connect the tread to the next piece. I am madly trying to get my plastruder back together after a clog, once I do I will print a set and take a picture to help explain the design.

Looks cool, seems to me like there is missing a hole for a pin holding these together.?

The tab in the upper left hand corner is inserted into the slot on the lower right. Just imagine takeing the model as it is now and repeating it on the diagonal following the blue line. Its missing pin holes at that joint though, so you'll need to drill one through to fully assemple a set of treads.

Its good though that it has guide slots and one for transmitting motion. It could work.

This is interesting but I don't see how it works. Once you get it printed a picture would be nice. showing how they connect.