My Ender 3 pro works nicely, but when printing the first couple of layers the extruder motor has a knocking sound every few seconds. As soon as i am up on layer 3-4 it goes away completely though. It looks like the extruder motor "jumps over" every time the knocking sound is heard. I cant see any flaws in the print though.

I cleaned out the nossle, but didnt find any obstruction, but since it is only an issue during the lower layers, could this be a bed leveling issue? If my nossle is to close to the bed, it might not manage to squeeze out the filament properly?