This shape can be described a few different ways. It's 12 stars, joined at the tips; 20 icosahedron cups joined at the edges; 6 crimped hoops that form a cage. The inner surface of the sphere is an icosidodecahedron, surrounded by 60 thin ribs.
This shape was designed by calculating the vectors on paper, then rendered using OpenSCAD.
Diamater is 5.6 cm (2.2 in).
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