I would like to see someone make a tread linkage that can be cast and molded (http://www.alumilite.com/produ..., along with a jig to allow for the holes to be drilled or a snap together system. It would be much faster than printing 40 of these.

This design could probably be converted to that system.

This is neat. Have been trying to do pretty much the same thing, but keep getting stuck with the inherent overhang. Have been working on making them in two/three pieces, but that presents an annoying issue of having to deal with joining many many pieces etc, then adding additional parts to line it up, so it gets worse and worse. Makes perfect sense when you see it done like this :-D