DLP (Digital Light Processing) is a 3D printing technology used to rapidly produce photopolymer parts. It's very similar to SLA with one significant difference -- where SLA machines use a laser that traces a layer, a DLP machine uses a projected light source to cure the entire layer at once.
Digital light processing (DLP) is a 3D printing process in which light-sensitive synthetic resins are cured layer by layer with UV light to create a three-dimensional object. In this process, the synthetic resin is located in a basin on the bottom of which is a glass surface through which UV light can pass. This surface is exposed to DLP projection. The core of the projection technology, developed by Texas Instruments, is an array of mirrors: the DMD (digital micromirror device). It consists of many micromirrors that divide the projected light into pixels.
After printing, the uncured resin must be removed from the printed shape. This is done with isopropyl alcohol - the shape is "washed". The support material is then removed, and the shape is cured in a UV chamber. Any support structure residue can still be ground away afterwards.
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