Crystal - Tetrahedrite
thingiverse
A Tetrahedrite crystal showcasing magnificent -43m symmetry. See: "Fahlerz" fig 34 in Goldschmidt's comprehensive Atlas Der Krystallformen (table 157, volume 3 Tafeln; published in 1916). https://archive.org/stream/atlasderkrystalltaf03gold#page/157/ Facet information is based on Mark Holtkamp's clever Dexter programme. http://www.smorf.nl/index.php?crystal=Tetrahedrite_034 He offers many stunning crystals on Shapeways at http://www.shapeways.com/shops/smorf Instructions Makerware indicates that it can be printed without support. The lengthy, thin {001} plane, which it's resting upon, should provide sufficient space to hold the crystal firmly in place on the build platform during printing. Fingers are crossed for a successful print.
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