by gringer, published
Print a car (including axles) as a single piece.
I realised after seeing other interlocking designs that it would be possible to print a toy car with no support. Assuming bridge generation works fine, this model will print out a small car, axle and all. There may be some fine knife work involved to separate out the axle and surrounding form.
Testing of the model (at least, v1) has found that the car prints, but wheels don't turn when run along a surface, because I didn't consider that the axle gap would cause the car to rest on a flat surface.
Update: v2 has a slightly larger wheel relative to the car thickness.
Update: v3 is a redesign after a bit more experience generating models.
Update: v5 is another redesign based on the noisemaker using internal wheels and a single long wheel for each axle (probably technically a bike now).
Update: v7 uses a cylinder rather than a gear for the wheels