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1 年前@Interstellar_1 Bambu has documented a procedure that works flawlessly when I’ve used it. Don’t know if it can apply to your hotend or not. Look for “hot hex wrench unclogging method” on this page. https://wiki.bambulab.com/en/x1/troubleshooting/nozzle-clog
@dom You sure it’s just the top layer? That looks like rubbing that might occur when something’s warping off the bed or when the bed isn’t leveled. In those cases, it would likely be present in more than just the top layer.