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Problem streaking lines with UM2ex

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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?

IMG_9251_zpse57i4mpk.jpg

IMG_9252_zpsef9rjyvj.jpg

IMG_9253_zpsq5fqfbzo.jpg

IMG_9257_zpssm2js0af.jpg

IMG_9256_zpsqndimj1y.jpg

IMG_9255_zpsowlqsnyz.jpg

IMG_9254_zps93yilkfn.jpg

Thank you!

Mickael

Edited by Guest

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