Prints started to get all wonky about a week ago. I couldn’t figure out the problem. Changed the nozzle, tighten the belts, lubed the z screws, and cleaned the carbon fiber rods. Disassembled the extruder and I didn’t see any clogging, but when I disassembled the hall sensor, I noticed a lot of wear. Then I found a piece of metal inside the extruder that I suspect broke off from the hall sensor somehow. A new extruder arrived yesterday and the X1C is printing like a champ again.
I don’t own one but I saw this on AliExpress: Upgrade Hotend For Bambu Carbon Lab X1and P1P Thermistor Heating Rod CHT Hard Steel Nozzle Bamboo P1P Bambulabsx1 J-Head Hot End