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Thanks for sharing this information. I have two Anycubic Kossel and one of them was experiencing wild temperature swing. We talking about 30 C-degree swings. The temperature instability is so bad that the print would be interrupted due to a thermal run-away alert. After following the steps you listed, the temperature is now rock solid!! thanks!!

Since I already have type 44 Thermal compound on hand, I used that and it works great. I was able to remove both heating element and the thermistor without removing the entire hot-end from the printer. I smother both the heating element and the thermistor in the thermal compound and stick them back into the hole. Wipe off the excess and all is well.