Problem streaking lines with UM2ex

[obus3d 8]

Hi I'm testing a lot of materials right now with my UM2 Extended and have this issue with "streaking lines", especially on the top surface and sometimes between details.

They happen with almost any material and seem to be in the same place every time. I tried alternating the flow, temperature increase retract a little, adjust speed (print speed never exceeded 50mm/s).

As you can see I tried to remove some of them with a scalpel but they remain visible.

Please see the following pictures. Does anyone know how to solve this?

Thank you!

Mickael

Edited January 7, 2016 by Guest

[DidierKlein 729]

Look at this to help you

[obus3d 8]

Thank you!

I'll look into this and try if this solves the problem.