Fuse Deposition Modeling (FDM) Printers print by melting filament at high temperatures and extruding them layer-by-layer. Each layer sticks to previous layers, and these layers adhere to each other and solidify to form the printed object.
Photo credit: Raise3D
Photo credit: LulzBot
Photo credit: LulzBot
Photo credit: Ultimaker
Photo credit: Raise3D
Photo credit: Prusa
Stereolithography (SLA) printers convert liquid resin into hardened plastic by curing the layers with an ultraviolet (UV) laser.
While Stereolithographic (SLA) printers use lasers to cure resin, Masked Stereolithographic (MSLA) printers use an LCD screen to cure the resin layers.
Photo credit: ELEGOO