REDREX Metal 1.75mm MK8 Extruder with 0.4mm Print Head for MakerBot Prusa i3 Anet A8 DIY 3D Printers 42mm high quality stepper motor with larger torque and less heat buildup. Special ceramic insulation cotton ensures the stability of heating; electricity-saving . Direct extrusion, without the heavy gears, compact size and weight. Compatible with most prusa 3d printers with some slight modifications. Support different filament materials:PLA/ABS/PETG/Nylon/Wood/Others .