If you have installed a new extruder we recommend to calibrate the hotend PID. Otherwise you can skip this step.

In Settings -> Temperature -> Fan speed set the value that corresponds to your most used slicer profile (min value = 0, max value = 255). For example, set it to 130 if you print mostly PETG and 255 if you print mostly PLA.

This is a little trick to make the PID calibration more reliable.

Run a PID calibration by selecting, Calibration -> PID calibration, from the menu.

Choose a temperature that matches your most commonly used printing temperature.

With a new extruder you will need to recalibrate your extrusion multiplier (per spool). Follow our guide here: 8. Extrusion multiplier and filament diameter