For years I tried to make tractor treads, summary, too many pieces, this was a 3d printer experiment, I'm amazed it worked out. I didn't get to making drive wheels for this, if you come up with some please share (I'v printed lots of track and want to use it). It uses standard nails for pins. The pitch was supposed to be 20mm, but I @#$%^@#$% up and its 21mm, sorry.

RepRap

i2

No

No

0.3

50%

Early technique of stacked extrusions of 2d profiles that are csg'd (its WAY faster than csging the whole part!)
I'm better at it now, I promise.