OULII Metal Hotend 0.4mm Nozzle for J Head 1.75mm 3D Printer MakerBot Extruder Material: Metal. Overall length: 3.5 cm 89 mm. Extrusion nozzle diameter: about 0.16 inch 0.4 mm. Heating pipe is 12V, 40W and 39.37 cm 1 m long. Hermistor: 100K NTC B value 3950  1%, 1 m total length. Melt High-temperature materials - up to 260  C with integrated thermistor 100k.