Q: Are these 3D printed?

A: No , they are not 3D printed. The car and reservoir are machined from solid aluminum and then anodized.

Q: How well do these cars track? I have had issues with track cleaning cars staying on the track.

A: I experienced the same and one of my main goals in designing my cars was making cars that would stay on the track. Having said that they are not going to magically fix bad track work.