Steriolithography technique is an additive manufacturing processthat is used for creation of parts layer by layer through the use of photochemical processes. In this process, chemical monomers and oligomers are cross linked to form polymers.An ultraviolet laser is focussed on a vat of photopolymer resin with the help of a CAD software. The resin is solidified photochemically and a single layer of the desired part is formed.After that, one layer is lowered by the build platform and the tank is coated with the resin again. This process is repeated again and again until the part is completed. After the completion, the part is washed with the solvent in order to remove the resin off the surface. It is a very widely used 3D printing technology.