LW-ASA (ColorFabb) wavy pattern

Hi everyone,

my first post here as google was not able to help.
I am printing LW-ASA from Colorfabb, which gives me good results in general. With taller objects with longer walls printed in vase mode I see a wavy pattern (see attached picture) in the middle of the said walls. As this doesn’t happen for the lowest layers I assume a temperature problem, but can’t get my head around what could be the actual problem. Printing without any fan running and with fans at about 20% did not change much.
I also attached my current settings. Maybe someone knows where the problem lies.





Speed2


Nobody has an idea? I am still playing around with the settings in the slicer but so far only reducing teh area slightly.

Looks like heat build up , allowing the material to foam up more than in the corners.