Yes, underextrusion. What speed/temp/layer height did you use? Here is the limit a UM2 can do:
Here is a good test. If you run this test it MUST be at 230C for any kind of valid comparison:
Underextrusion. That's what you need to type in the search box above. You are not alone... You may have a problem with the feeder; you might be using too low temperature or too high speed; your Teflon isolator might be deformed; your Ultimaker blue filament might be to blame.
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