About this 3D model

Toy car with wheels that move, but requires no assembly. Here is a short video: http://www.youtube.com/watch?v=eWW5DFWcvhE The wheels took some effort to loosen up after printing, but they now roll quite nicely on the right surface. Other problems: There is definitely some warping from the plastic cooling/shrinking (I used ABS). The transition from the wheel to the axle is a bit steep for the makerbot.