2013 Southeast con robot. This robot will be full open source, but until Saturday morning 4/6/13 the files will not be open to public, ;) So bad news, we lost. Yup, in the process of losing we developed a new term for amature mistakes. "Revpol" this is defined as apply voltage backwards, or reverse polarization. Anyway, we will be uploading all source code soon along with a BOM. In the meantime until the team is ready to upload everything I will answer questions regarding the build in the comments as to get people going.So we posted some singled out items for you. But for the most part the entire sketchup file is available and parts can be picked and exported in a singular fashion. Tank tracks: These were printed, but I had to dremel out a nice amount of material to create a bevel for the sprocket gear to enter and exit the linkage without bindage. I used a drill bit to clear the holes keeping all holes in the tracks consistent at around 3 mm-3.1 mm whatever drill bit you have. I then used cut pieces of polycarbonate 3mm longer the the tracks are wide. Insert and use a lighter to get the end hot and then use the lighter to push the rod in the tracks "mushing" the soft plastic and creating a riveting effect. The repeat on the other side. Leave one link where this is not done on the outer side; this is your master link. ABS should work just fine.