The Hotend with Hardened Steel Nozzle has a special all-in-one design for Bambu Lab 3D printers only. The nozzle is integrated into the heatblock and connected to the heatsink via a thin metal tube for best performance. Having this design allows the hotend to heat up much faster than a regular hotend, and the all-in-one design minimizes issues that might come up when swapping nozzles. The heatsink is made of high thermal conductivity aluminum alloy, and the throat is made of TC4 titanium alloy. The nozzle is made of a combination of copper alloy and hardened steel, which ensures hardness while allowing for high flow printing.