Cylindrical Slide Rule
thingiverse
Contains C, D, and B standard scales. I recommend using a brim when printing, as I got a little bit of warping without it. Before assembly, I did very light wet sanding of the main cylinder and the insides of the small rings with 1200 grit sandpaper. I then rubbed the innner cylinder surfaces with paraffin for a smooth-turning slide rule.
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