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Just recently, my nozzle temps have been extremely unstable. Whenever I start a print, the recently stable 200 degrees Celsius drops drastically - by around 15 degrees. This almost always triggers thermal runaway. However, if it doesn't, the temperature fluctuates rapidly by around 7 degrees during the print.

I've already calibrated the PID, and even tried to use auto temp.

Could anyone help fix this? Thanks in advance.

Edit:

I replaced the heater cartridge and now the temperatures are stable. Thank you all for replying!