Here we have a 3D printed wheel intended for 1/10 scale RC rock crawlers. The intent is to have the flexible arms of the wheel flex and articulate as it conforms to the terrain and obstacles. I have not had a chance to test these out yet, but I am hoping that they work well enough to fine tune the design.
Simply print out the wheel halves and bolt together with 4-40 (or metric equivalent) screws. The wheel assembly is intended to take the place of a traditional wheel and tire, so just bolt 'em on and go!
Bonus: If you can get a hold of a can of flexible coating, like the stuff used to treat the beds of pickup trucks, then you could spray it onto the contact surfaces of the wheel and give it a better coefficient of friction.