The Prusa i3 is a popular model of 3D printer known for its reliability and ease of use. Developed by Josef Prusa, it features a Cartesian design, which means it moves along three axes to create objects layer by layer. The printer is often praised for its open-source nature, allowing users to modify and improve the design. This printer typically uses Fused Deposition Modeling (FDM) technology, where thermoplastic filament is melted and extruded through a nozzle. The Prusa i3 is suitable for both beginners and experienced users, offering a balance of affordability and high-quality prints.