What causes this noodle print issue?

[cekuhnen 1]

0.8 nozzle

 

i have very good result when using 0.4 line width but with 0.6 line width I often get those noodle sculptures 

 

interestingly the base layers often are fine 

 

 

[geert_2 558]

Maybe you are printing too cold and/or too fast for the required amount of filament to properly melt and be extruded?

 

[juangiluruguay 0]

I assume that you changed the nozzle size in the printer from 0.4 to 0.6?? and by OFTEN, you mean every time withe same settings? or just some times yes and other not? Which material are you using? and that.. looks like only has a wall of 1 layer. When was the last time you cleaned the nozzle?? There are so many variables, that is difficult to guess with only that information.  ?     3D printers are not plug and play, even if you pay 5000 dollars for 1!!. Not to mention the cost for parts... That reality is depressing/shocking...

[UbuntuBirdy 56]

You changed the nozzle in the printer, but did you also change the nozzle diameter in cura? Looks for me like the material flow is not right set for the nozzle diameter.