From time to time, and for many different reasons, you will find yourself needing to replace your hotend (like a real bad clog, abrasive materials, or time for a new/different size nozzle etc…). Unlike other 3D printers, Bambu Lab hotends can be installed cold and as such they don't have the issues other 3D printers & hotends have with oozing or leaking filament between the nozzle and the heat break interface. The reason for this is because Bambu Lab hotends are designed with the heatsink, throat, heater block and nozzle as a single unit. In addition, a spare hotend is also provided with every new X1/X1C 3D printer.
Bambu Lab hotends are also sold both as a single hotend (consists of the heatsink, throat, heater block, nozzle, thermal grease and retaining clip), and as a complete hotend assembly (consists of everything in the hotend, plus cooling fan, ceramic heater, thermistor, silicone sleeve, and all pre-assembled and ready to use in your X1/X1C 3D printer). This wiki page is specific on HOW TO replace your complete hotend assembly with another one.
Tools & parts you will need: H2 Allen key and a new Bambu Lab complete hotend assembly. If you don't have a complete hotend assembly, you can order one from the Bambu Lab Online Store.