Stereolithography, also known as SLA or SL, is an early type of 3D printing technology that solidifies liquid resin into layers using an ultra-violet laser to photocure photopolymer resin according to a pre-programmed design, allowing for the creation of 3D objects in a layer-by-layer process similar to FDM. SLA can be used to produce medical models, prototypes, patterns, production parts, and jewelry.