Abstract: Embodiments disclosed herein relate to an extruder for a 3D printer. The extruder for a 3D printer includes a finned head, a lower tube being accommodated at the lower portion of the finned head, a heating base accommodating a lower portion of the lower tube, and a dispensing nozzle being fitted at a coinciding hole at the heating base. The lower tube is characterized by an externally threaded opposing ends and a plain tube being made thinner in wall thickness and said plain portion made longer, and a polytetrafluorethylene (PTFE) material coating the internal wall of the lower tube.