Analysis of information sources in references of the Wikipedia article "Stereolithography" in English language version.
More specifically, as the print platform lowers itself into the resin glass tank, an ultraviolet laser light, from underneath the see-through tank, shines on it. (For this reason, SLA is sometimes called the laser 3D-printing technology.) Exposed to the laser light, the resin cures, solidifies and sticks to the platform. As more resin is exposed to the laser light, the pattern is created and joins the layer above. As more and more layers are being created, the build platform slowly -- very slowly -- moves upward, finally pulling the entire object out of the tank as the print process is finished.
