Thermoplastic filament is pushed through a heated nozzle onto a surface, turning it into a malleable state. The material then follows a pre-defined path (based on a 3D model), building an object layer by layer as the plastic cools and hardens. Once the plastic is cool, the object is ready for removal. FFF printers enable you to print with a wide variety of thermoplastic in many different colors through dual extrusion heads.