Is that the Ultimaker silver filament? we've heard a few people here lately having this filament break easily, there may be a bad batch of this stuff causing a lot of extra tension in the bowden tube..
For sure read the guide Labern is pointing at, but maybe also try another roll of filament.
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Labern 775
This is called under extrusion, have a read and follow through the steps in THIS guide first. If your problem persists, report back.
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