Stereolithography is an additive manufacturing process that uses light to cure photosensitive resin to form a model. This process is quicker than FDM printing due to the fact that a whole layer can be complete in a few seconds.
The resin is cured on a build platform that moves upwards after each layer is exposed. The use of supporting structures is still needed and a few more steps are introduced.
Since the part is created in a resin filled vat, the uncured resin surrounding the part needs to be washed off. A curing of the part is then needed to insure rigidity and a final drying process is also required.
Parts made through Stereolithography printing are more precise than traditional FDM methods.