Parametric airless tire
thingiverse
This design is inspired by Bridgestone's airless tire concept: http://www.physorg.com/news/2011-12-bridgestone-airless-concept-tokyo.html Using the natural springiness of plastic, this design can absorb shock and vibration in a manner similar to a pneumatic tire, but cannot be punctured. Videos here:http://www.youtube.com/watch?v=3LctFwZhY1Mhttp://www.youtube.com/watch?v=sXBgaaI7dHY This design is fully parametric. Update: Added tiny (0.001) offset between spirals. Openscad errored when trying to export an STL otherwise. Instructions Tweak values to suit your application, compile, slice and print! If you're having traction problems, I suggest a zig-zag of hot glue around the circumference to give it a more frictious surface.
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