Geeetech MK8 Dual extruder e3d nozzle 0.3/0.35/0.4/0.5mm 1.75/3mm filament for kossel This is a Dual Extruder which can be used on 3D printers like Mendel, Prusa, Makerbot, and Printrbot and others. 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. The possibilities are only limited by your imagination.