Regularly cleaning and performing some basic maintenance on your extruder will help to maximise the lifetime of this hard working part of your printer.
Connect your Me2 to MatterControl and raise the print head off the bed. Turn on the cooling fan and click the preheat button to raise the temperature of the extruder to around 220°C. Unload any filament currently in the machine.
Use a light scrubbing motion with a Nylon scouring pad to remove any built up plastic and scale stuck to the tip.
ImportantDo not attempt to remove cold plastic from the tip by scraping or cutting. This will likely damage the printer nozzle.
If your extruder nozzle is heavily soiled with baked on scale or excessive residue has built up inside from improper purging you may have to replace your extruder nozzle. Find out more in this article.