A resin 3D printer is a type of additive manufacturing device that uses liquid photopolymer resin and a light source, such as a laser or LCD, to create objects layer by layer. This process, known as stereolithography (SLA) or digital light processing (DLP), enables the production of highly detailed and smooth-surfaced parts. Resin 3D printers are widely used in industries requiring precision, such as dentistry, jewelry, and prototyping. They differ from filament-based printers by offering higher resolution and finer details, but often require more post-processing and careful handling due to the chemical nature of the resin.