francfalco 39
Also, check your Bowden tubes are nice and clear and filament runs through them without any obvious resistance.
But just as importantly, i would also give your printer a bit of a vacuum and clean - won't help the under extrusion, but it'll look much better in the Thread shots!
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DidierKlein 729
You have the same problem on two different printers?
I'll copy paste here the cool answer from @gr5
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