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123D Design introduces lines when a sphere is scaled non-uniformly - is that a problem?

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I want to make some pretty simple tubes to print for use as light diffusers. I'm using Autodesk 123D Design and I'm encountering a phenomenon which I want to know whether it would affect the print. The method I'm using involves squashing a sphere and subtracting it from a solid cylinder. Squashing the sphere introduces a line for some reason and I don't know what it's there for or whether it might affect the print.

squashline.thumb.png.1015edaa23f82f82314ad27dc5fb29ab.png

squashline.thumb.png.1015edaa23f82f82314ad27dc5fb29ab.png

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