Fused deposition modelling (FDM), also known as the material extrusion additive manufacturing technique, utilizes polymers as the raw material (filament). The filament is usually heated to a molten state and then extruded through the nozzle of the machine (3D printer).
Stereolithography is an additive manufacturing process in which a liquid photopolymer resin, also known as resin, is cured layer by layer using a UV laser.
Vacuum Casting is a fast and cost-effective prototyping method that is typically used to produce small numbers (usually up to 20) of highly accurate polyurethane prototype parts. It is a slightly slower process than SLA alone because of the additional steps involved in the process, some of which are manually intensive.