Bamboo Lab X1 Carbon, X1, X1C Hotend Complete Kit for X1 Series 3D Printer, Full Assembly Hardened Steel Hot End with Fan, Thermistor, Ceramic Heater, 0.4mm Nozzle, Extruder Heating Block ReplacementBamboo Lab X1 Carbon, X1, X1C Hotend Complete Kit for X1 Series 3D Printer, Full Assembly Hardened Steel Hot End with Fan, Thermistor, Ceramic Heater, 0.4mm Nozzle, Extruder Heating Block Replacement