In the stereolithography process, light-curing resins are hardened layer by layer by a laser. These resins are called photopolymers.

In this process, liquid resin or wax is the starting material. A UV light source or laser hardens the liquid material at the desired locations. This technology is particularly well-suited for producing vacuum casting master models. It allows for a very smooth and precise surface. Only monochromatic models can be produced.