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A Deeper Face-Turning Icosahedron. The short form of this gives the puzzle its name.
At first this puzzle seems to be a member of the radiolarian series but it was designed by a different person after the first three radiolarians. It differs from its cousins by its cutting depth.
Just like the other face-turning Icosahedra, the DeFTI can jumble.
In 2012 Jason Smith presented another design of this puzzle he called "Radiolarian 4" because it fits into his series of face-turning icosahedra.
For the first three years this puzzle was available only as a 3D-print from shapeways. Beginning with 2013 a mass produced version is sold under the name "Eitan's Star".
Weight: 320 grams.
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Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Lawrence Cuthbert.
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