LulzBot TAZ Single Extruder Tool Head v2, 0.35 Nozzle Compatible with TAZ 4, TAZ 5, or KITTAZ. Prints 3mm filaments. Not 1.75mm compatible All-Metal LulzBot Hexagon Hot end is capable of heating to 300C (572F) Comes pre-assembled and includes heat sink fan and extrusion fan with additional power leads for TAZ 4 and KITTAZ owners Not recommended for flexible filaments like NinjaFlex and SemiFlex. See the LulzBot Flexystruder or FlexyDually for printing flexible materials TAZ 4 and KITTAZ owners will require a firmware update when installing this tool head