Previous years we either used completely Vex, or hand fabricated chassis using steel corner brackets and aluminum plate. This year we were able to 3D print the majority of the parts, which made it much easier. For example, previous years we were limited in the tire types we were able to use, but now we were able to make a fully integrated hub and drive coupler.
Just a note about the files, they are not at all parametric. I drew a picture in my head with the measurements and wrote the code. If anybody decides to try building this, let me know and I will be able to give you measurements off the original.
Hop on #reprap irc and ask me for directions :P
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