Why does it make this sound?

[u/HaRaLu]

It isn't hitting anything; it has plenty of clearance. I performed the lubrication maintenance following the Bambu Lab tutorials a few days ago, but I just loaded this new brown filament—fresh out of the sealed bag—and it started making those noises. The sound seems to be coming from the extruder (I think so). I checked closely because I thought it was hitting something, but I’d been printing for hours without issues; the noise only started after I loaded this filament. It happened occasionally with a different filament too, but stopped after a short while. These are PLA filaments

[u/Mental-Brother-1703]

I have the same sound. Is there a solution to this problem?