Chestahedron
thingiverse
Introduced by Frank Chester, the Chestahedron is the first-ever heptahedron with seven equal area sides, comprising four triangles and three quadrilaterals. This unique geometric figure encloses a volume, and when rotated along its vertical axis, it forms an intriguing bell-shaped external surface made up of a conical top connected to a hyperbolic bottom. Learn more about this fascinating shape at http://www.frankchester.com/2010/chestahedron-geometry/.
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