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Adds the extrusion of the closed profile to the solid, regardless of the extrusion direction.

  1. Start with a solid like this, with a closed profile within one of the inside facets.

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  1. Activate Imprint. For the sake of comparison, first select Auto Detect. In this example, the last two options in the Inspector Bar have no blend (fillet or chamfer).

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  1. Select the inner face that contains the profile, then select the profile itself. Extrude the profile this way:

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This is the result: because the profile was extruded inward with respect to its face, its extrusion was subtracted from the solid.

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  1. Undo, and now select Add.

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  1. Select and extrude the profile the same way, and now its extrusion is added to the solid.

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