Resin printers are a type of 3D printer that use liquid resin to create objects layer by layer. They work by shining a light, often from a UV laser or LCD screen, onto the resin, causing it to harden in specific areas. This process allows for high-resolution prints with fine details, making resin printers popular for creating intricate models, jewelry, and prototypes. Unlike traditional filament printers, resin printers require post-processing, which involves cleaning the printed object and curing it under UV light to achieve maximum strength. While they can be more expensive and messier than filament printers, the quality of the finished product often justifies the extra effort.