3D printing

Before everyone gets too excited, keep in mind most of the materials used in 3D printing will not stand up the the heat inside of a car during a sunny day, or the UV from the same light. There are some exceptions, but they are going to cost more.

That said, you CAN use it very successfully in what's called "lost pla" casting. Basically the same as "lost wax" but you can recreate the PLA based negative (positive?) with relative ease as compared to wax.