100% Creality official K1/K1 Max Extrusion Kit The K1 extruder with dual gear drive does not damage the filament supports stable smooth and precise filament feeding. It is easy to Install and use there is no need to dismantle the entire extrusion mechanism kit and reinstall the motor wire. After opening the back cover of the extruder you only need to replace the extrusion part. Compatible with K1 K1 Max 3D Printer work with different filaments like PLA/TPU/PETG/ABS etcIf youhave any question or problem please feel free to contact us