Artifacts in 3d print

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Any idea what might be creating these lines? The model looks perfect in a rendered view in my 3d software, and also in the Simplyfy 3d interface before processing. It looks like raised veins on the final printed piece.

Here is a link to the image:

https://drive.google.com/file/d/1caxeWN ... sp=sharing

Thanks!

[S3D-Alex]

I am not totally sure which lines you are referring to here. Could you please be a bit more specific?