@HMorton I almost forgot one other thing when it comes to the Mark Sharp feature. Once you enable Smooth Shading, you need to also enable Auto-Smooth for Mark Sharp edges to work. However, there's an alternative in the form of using an Edge Split modifier. If you mark edges sharp on any mesh, you can just apply an Edge Split modifier with "Sharp Edges" checked. You won't need the Edge Angle checked in this case, as long as you have marked edges as sharp.

Here's an example of that:

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