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is this slicing, settings or hardware problem?

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Printing a 70mm ring, 10mm high in ABS, I am getting some very smooth outer walls in some areas but in some parts the infill exceeds the outer perimeter resulting in less smooth vertical surface. In this photo of the first layer you can see what I mean.

In Cura 13.06.5

Infill overlap: 30 (I need a strong part with good wall and infill bonding)

Print speed 60

temperature 255

diameter 2.95

flow 90%

Initial layer thickness 0,3

Any idea how I could solve this rough walls?



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Ah - THANK YOU - this is a new bug and now I finally understand it after seeing this post. 13.03.X doesn't have this bug. The easiest fix for you might be to make your "skin" .8mm thick instead of .4mm thick. Or go back to cura 13.03. Here is a quick explanation in a photo of the bug:



Infill was set to 50% for both images above.


Daid (author of cura) does most of his tests using cubes (but not all!) and this bug is more noticable in a cylinder.


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