Usually, when people show very nice prints, they printed these slow. Like 30mm/s, or maybe 50mm/s. It makes a big difference!
One more thing: (some people may not like me saying this...)
If you're using the UM blue filament - You can get better results by using better filament. I often had uneven extrusion with the UM blue. I'm now only using it for trying out stuff, not if I want to print something that actually has to be good in the end.
it is not (entirely) related to the amount of problems/bad quality you are experiencing, but your shell thickness should always be a multiple of your nozzle diameter... eg. 0.4, 0.8, 1.2, 1.6 etc. for a 0.4mm nozzle...
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