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Visualizing Mathematics with 3D Printing
Chapters
1. Symmetry
2. Polyhedra
3. Four-dimensional space
4. Tilings and curvature
5. Knots
6. Surfaces
7. Menagerie
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6.3
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"Klein Bottle Opener", by Bathsheba Grossman.
Links
https://www.bathsheba.com/math/klein/