Modify your K8200 3D Printer to use 1.75mm filament with a 0.35mm Extruder. This kit comprises of a new extruder assembly including a 0.35mm nozzle, heater block & sensor, high power Z-Axis driver and all necessary hardware (spring, pulley, bearing, mounts and screws). Your original Extruder motor is used, a firmware upgrade is required and it is recommended to use the Z-Axis Upgrade Kits (K8204).