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Cura 2.3.0: How to print only two perimiters?

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Say you have a sphere. Does a sphere have a top layer? What is the top of a perfect sphere? Is it a singular point, or the entire top half of the sphere?

Because the top half of the sphere gradually gets smaller, each layer of the top half is a top layer in a way.

For something like a cube, the difference between walls and top/bottom is much clearer.

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Let me try to explain it in a different way. Cura tries to make sure that where-ever on your model you drill straight down you pass at least the top thickness amount of material. If you have sides at a tilt-angle, Cura needs to add material to enforce that "rule".

Yes, your pyramid has layers that are regarded partially as top layers. That was exactly my point.

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