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  • my error, cell A5 should be 0.

    making some variation on the below. Also some coat hooks which will have 'ball' ends.

  • That also works: it just means you're looking at where the bottom surface of each layer touches the sphere, instead of the top surface.

  • That's the correct approach if you want to sand it down to a hemisphere, I think.

    @moocher Slightly jealous of the workspace that you clearly have, I'd love to be able to do stuff like that once in a while.

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