Something like fringe and spidercombs.

[fofa 0]

Hi there
Unfortunately our Ultimaker3 has been a troublemaker.
Hoping that it will help, I cleaned both printcores, use only UM3 Material and almost all the recommended settings.
After cleaning, one print was absolutly awesome.
The next print, not really what we are looking for; Something like fringe and spidercombs.
What are we doing wrong? How can we fix that issue?
thank you very much for your help, appreciate it a lot!

[SandervG 1,521]

Hi @fofa , thank you for your post and welcome to the community! 

You may want to enable retraction, that should definitely help improve your print quality.