Stereolithography (SLA) allows you to convert a CAD drawing into a three-dimensional object in only a few hours. The process begins with creating a 3-D model of your prototype in a CAD program. The SLA apparatus is connected to a computer. The CAD model is then “sliced” horizontally into thin layers by the SLA machine. An ultraviolet laser traces the first layer of the prototype on a metal platform that is submerged just below the surface of a vat of epoxy photopolymer. The liquid solidifies wherever the laser touches it. Once the layer is traced, the platform sinks the thickness of a layer below the surface level of the liquid. The layer is usually .005 of an inch thick. This process continues until each layer is built. Each layer bonds together and forms the three-dimensional prototype. It is then taken out of the SLA machine and placed into an ultraviolet oven that will thoroughly cure the part. Each part is sanded by hand and finished to meet the design specifications.

Benefits of using SLA

• Test product

• Catch errors

• Improve design 

• Rapid manufacturing

• Market product faster

• Save time & money

• Inexpensive compared to other techniques

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