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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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6.7
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Shrink away some of the surface (in red) and fill in the hole (in green).
Thingiverse
http://www.thingiverse.com/thing:1668577