Stereolithography (SLA) is often considered the pioneer of the Rapid Prototyping industry with the first commercial system introduced in 1988.  The process uses a platform that is lowered into a reservoir of photopolymer resin,  such that the surface of the platform is a layer-thickness below the surface of the resin. The laser beam then traces the boundaries and fills in a two-dimensional cross section of the model, solidifying the resin wherever it touches. Once a layer is complete, the platform descends a layer thickness, resin flows over the first layer, and the next layer is built. This process continues until the model is complete.

• Large variety of specialized materials
• Can produce durable functional components
• Excellent for sand casting and investment casting patterns.
• Prototypes suitable for form, fit, and controlled functional testing.