How to Unload Filament on an Ender 3 Pro

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There are a few reasons why someone might want to unload filament from a 3D printer:

To change the filament color or material: If a user wants to print an object in a different color or material, they will need to unload the current filament and load the new filament.
To troubleshoot a problem: If a user is experiencing issues with their 3D printer, they may need to unload the filament to access the print head or other parts of the printer to diagnose and fix the problem.
To preserve the filament: If a user is not planning to use their 3D printer for an extended period, they may choose to unload the filament to preserve it and prevent it from pulling moisture or becoming damaged in any other way.
To fix a jamming issue: If the filament is jammed in the extruder, unloading it can be used as a solution to fix the issue.

Press the knob to enter the marlin LCD menu and turn it to navigate between the options.
Navigate to Temperature > Nozzle.
Adjust the nozzle temperature by turning the knob and confirm by pressing it.
Use whatever temperature you would be printing with, minus about 10°C. For both PLA and PETG 210°C usually works fine.

Wait until the current temperature (bottom) matches the target temperature (top).

Press down on the extruder lever arm and pull out the loaded filament.
Fully pressing down the lever arm might lead to the filament snagging when you try to pull it out. Just pressing it a bit will usually suffice.

Navigate to Temperature and press Cooldown.
If you do not have the Cooldown-option available, you can just repeat step one and set the temperature to 0°C instead.