Stereolithography Process

One of the most well known forms of prototyping is the stereolithography (SLA) process. SLA is an additive fabrication process that produces parts from useable CAD files in a matter of hours. These parts are best suited for applications where design verification and appearance models (post finishing) are needed. While the process used to produce SLA models is relatively simple, the prototype parts produced are high in detail and widely used for engineering evaluation.

The process begins by slicing a three-dimensional CAD model into thin layers, then draws the layers one at a time, with a UV laser in a vat of UV sensitive photopolymer. The laser solidifies or cures the resin and bonds the layers to produce a physical three-dimensional representation of a CAD model. SLA models are generally accepted as the most accurate and true-to-form rapid prototypes available. Two important considerations that will help determine the look and feel of your SLA model are resolution and finishing.