sphenoid
thingiverse
Demonstration of Basic Crystal Form. Relative Axis Lengths Can Be Altered in OpenSCAD Source Code. The Sphenoid with Equal Axes Forms a Tetrahedron, Specifically a Sphenoid Tetrahedron, Which Belongs to the Isometric System, Including Famous Geometries Like the Cube, Octahedron, and Dodecahedron. The Sphenoid, When Its Axis Lengths are Unequal (Such as in sphenoid_30_30 or sphenoid_30_50), Falls Under the Tetrahedral System.
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