The stereolithography process usually begins with a CAD drawing, MRI scan, or data from a 3D scanner. This data is processed by the stereolithography, or SLA, machine which navigates a moving low-powered ultraviolet laser beam through the use of a series of mirrors. Below the mirrors is a vat of photocurable resin. The laser etches a two dimensional cross section onto the top layer of resin, effectively hardening it. After the first layer (approximately .0005 to .02 inches) is completed, the work surface is moved downward by an elevator, exposing the next layer to be cured. This process is repeated, with successive layers bonding to each other, until a complete three dimensional model is created.

In order to produce a part using the SLA process, a separate base must first be constructed. The purpose of the base is to attach the part to the elevator so that it does not move with respect to the floor. After the processing is complete, the resin must be completely dried before the part can be finished. The finishing process can include sanding, painting, enamel coating, or additional machining. Without this finishing, the product has brittle charateristics, and is sensitive to humidity and UV light. The fully comleted and finished product can now be used for a wider variety of testing possibilities.

Check out a simulation of this process being performed to produce a ring shaped product.