FDM 3D printing is one of the fastest 3D printing methods. FDM stands for Fused Deposition Modeling. It quickly lays down layers of plastic to make your model. The parts can be strong, temperature resistant and look great! FDM 3D printing uses a strand of plastic, called filament, that is created using regular plastic pellets. It costs about $25 per kilogram (2.2lbs) of plastic.