I printed bepppppo's snap-on car for my son, but the polycount on the wheels left me wanting smoother wheels. So I re-designed them... making them rounder (120 steps rather than 30ish), bigger (makes them roll better on the plastic axles), and DUALSTRUSION RIMS for multicolor fancy style.
Print beppo's car, then print these rims.
There are two small registration shapes in the spoke file so if you want to use the "multiple" option in Skeinforge (to print all four wheels at once) everything will line up correctly.
Sorry, no non-dualstrusion mode right now... It took way too long to get my dualstrusion alignment correct, so now I've got to get back to my regular work.