You’ve seen that 3D Printers are becoming all the rage, here is an example of how they can be used in rc. The spiked wheels in the pictures were made from a 3D printer and you can make them at home too. First you have to buy a 3D printer, then you have to visit Thingiverse and download the spiked wheel file. Feed the file into your printer and sha-zam, you end up with a set of crazy spiked wheels. The person sharing the file over on Thingiverse, kallaspriit, says the spiked wheels get great traction on snow, but they look like they would get a lot of traction on most any loose surface.
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Spiked Wheel Gallery
Thanks to HobbyMedia.it for the heads up on this one.