Marlin PID Autotune Failing. After changing the hotend and heatbreak to copper and all-metal titanium, I've run the M303 PID autotune several times, but I always end up with this terrible oscillation
3D printer PID calibration
Hot end temp fluctuations after PID autotune : r/FixMyPrint
FR] add Bed temp PID edit option to menu · Issue #14952 · MarlinFirmware/ Marlin · GitHub
hotend - PID tuning 50 W cartridge in Marlin - 3D Printing Stack Exchange
calibration - PID tuning and different filament temperatures - 3D Printing Stack Exchange