GregValiant 1,454
I think what @Smithy is getting at is that if a model is hollow (like a pipe) then it has 2 outer walls (one facing air outside and one facing air inside) and they both get printed. It's "Spiralize Outer Contour" and you have two outers.
So it appears that the way you have it modeled isn't suitable for Spiralize.
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Smithy 1,146
Is the model a solid cylinder?
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