Cylindrical Slide Rule
by Mortimer, published
Update: I came up with a center piece that I'm happy with. As I am currently CAD-less, my friend J. Ferrari did the CAD work for the center piece.
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I just created a thing
which is my concept for a core to join the two halves of this slide rule.
If you do that, then you're printing with support which won't leave a smooth surface and the pieces won't slide as well together. I also don't like having a lip that protrudes in the Z direction. If it's thin enough to snap together, it'll be likely to break along a layer boundary. But if you can come up with a good way to do it, I'd love to see it.
Wikipedia has an article that explains the use and history of the slide rule.
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