“In the old days, when we prototyped, it would take a machinist sometimes 6-8 weeks to make a simple pump housing. I can do that in 6-8 hours. That’s what it does.” -Bill Bryan, Director of Additive Manufacturing at Stratasys Direct Manufacturing. Stereolithography (also known as SL or SLA) is a 3D printing process that uses a UV laser to solidify liquid photopolymer resins. SL is perfect for concept models, master patterns, large prototypes, and Investment Casting Patterns because of its ability to accurately produce fine details. Stratasys Direct Manufacturing offers a complete range of Stereolithography materials that mimic the properties of ABS, polycarbonate, and polypropylene.