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Shade Smooth doesn't seem to work with this geometry, as you can see from the following screenshots.

What would be the best workflow for making the inside tube (and the rim) be perfectly smooth?

PROJECT FILE

Without Shade Smooth: enter image description here

With Shade Smooth: enter image description here

Mesh: enter image description here

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  • $\begingroup$ Hi. Please use a title that matches the content of the question. It should be descriptive but succinct, unique and identifying, summarizing the issue in such way that anyone searching for a similar problem is likely to find it. Use the edit link above, remove anything superfluous, avoid words like "this", "help", "issue with" or "question about". Remember, your title is the first thing potential visitors see, answers you get depend heavily on how insightful it is. See What is the problem of asking “How do I do this?" $\endgroup$ Oct 20, 2023 at 23:45
  • $\begingroup$ @DuarteFarrajotaRamos I’m open to suggestion $\endgroup$ Oct 22, 2023 at 2:29

1 Answer 1

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First thing dissolve these edges:

enter image description here

You have bad split normals, go into the Object Data panel and Clear Custom Split Normals Data:

enter image description here

Then enable the Auto Smooth and set the Angle to 80°:

enter image description here

You also need to remove the bad shading that we can still see here:

enter image description here

Select all in Edit mode and X > Limited Dissolve, then create thes edges to prepare the topology to a correct inset:

enter image description here

Select all these faces and i to inset:

enter image description here

Result:

enter image description here

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  • $\begingroup$ Very cool, thank you for this. The object is a solid exported from Fusion 360 and the topology always gets a little screwy with that workflow. But the upside is that I always improve my geometry skills trying to fix it! $\endgroup$ Oct 22, 2023 at 2:27

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