FDM is the most commonly available and versatile technology for 3d printing. It is a technology for additive manufacturing that works by extruding a plastic filament through a small, moving, nozzle in order to build 3d prints layer by layer. Traditionally, items printed with FDM technology has been known to have inferior surface quality compared to other additive manufacturing methods, however, with new and more precise production equipment, this is a thing of the past.