MatterHackers CleanTip Nozzle and Heater Block Combo Pack Stainless Steel 0.4mm nozzle and aluminum heater block, coated with Tungsten Disulfide for less jams, easier cleaning, and printing with metal powder and carbon fiber filaments. Our new CleanTip Nozzles and Heater Blocks are coated with ultra-low friction Tungsten Disulfide (WS2) No filament sticks to our stainless steel nozzles and aluminum heater blocks. When your hot end is up to temperature, it wipes clean with virtually anything. No more baked on filament mess or difficult nozzle swaps due to crusty old filament. Note: Compatible with E3D v6 and Hexagon hot ends such as the Robo R1, LulzBot Taz 5 and Mini