Geeetech 3D-Drucker Dual Head MK8 Dual Extruder 0,35 mm/0,04 mm Düse. The two print heads are conjoined with a piece of high hardness aluminum bar with good heat dispersion and high reliability. The main benefits of this Dual Extruder includes being able to print more complex objects with support structures and more aesthetically pleasing objects that feature multiple colors or multiple materials.