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Difference between skin, shell, and walls?

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What is the difference among these three terms?  Under "Infill" settings, I can set the "infill overlap" and "skin overlap" percentages.  Under "Shell" settings, it talks about Wall overlaps.  Skin overlap defaults to 5% and 0.02mm -- why both settings?  Don't they conflict?  And why does infill overlap default to 0?  Shouldn't it also be 5%

Edited by lordnimon

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The skin are the topmost layer, so the "skin overlap" is the overlap between the wall of these layers and their filling.

The "infill overlap" is the overlap between the wall and the infill, i.e. inside the object/ below the skin.

In the shell section you talk about, there is the setting for wall overlap compensation. This is for reducing the extrusion in areas where the print head has to go over twice while printing the wall. (see ttps://ultimaker.com/en/resources/20415-shell)

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