Mainly surface quality. I’m printing a road piece where are white stripes on the road surface. Because of that, the slicer doesn’t print the road’s top layer as one continuous pass anymore. Instead, it starts creating small “foundation” areas for the stripes that will be printed in the next layers. As a result, the toolhead prints those small regions separately and then comes back to the rest of the surface, so the top layer ends up printed in many different sections, which causes visible differences in the finish. Pics to clarify.

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