3D Printing Technology Comparison: SLA vs. DLP

The technology at work in laser-based stereo lithography (SLA) and digital light processing (DLP) 3D printing follows very similar principles, but can produce significantly varying outputs. The word “stereolithography” comes from the Greek words “stereo,” meaning solid, and “(photo)lithography,” which is a form of writing with light. In 3D printing, stereolithography does just that: drawing solids with light. SLA technology uses light to turn liquid resin into a solid object, one layer at a time. By definition, both laser-based SLA and DLP are types of stereolithography, but drawing a layer with lasers can be completely different from projecting layers as a flat image.

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