You need to buy everything depending on what you already have in spare :
- CHT nozzle from aliexpress
- hotend block from aliexpress
- ceramic heater from bambulab/bambustore
- thermistor from bambulab/bambustore
- colling fan for hotend from bambulab/bambustore
- silicone sock from bambulab/bambustore
Step 1 : Change the nozzle of the aliexpress hotendblock with the CHT nozzle
Step 1 : Once you get everything, for heater, thermistor, fan and grease follow this second part of this video tutorial :