Also known as Fused Filament Fabrication (FFF), this is the most common method of 3D printing. It involves melting plastic and extruding it layer by layer. The plastic dries instantaneously, creating a solid object.
SLA printing uses a laser to cure layers of liquid resin into your target object. Parts are extremely accurate, but often more brittle compared to parts printed using FDM.
Computer Numerical Control (CNC) Milling uses software to program toolpaths for cutting, carving, and drilling sheets of material such as metal, wood, and plastic.