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Interlocking Tetrahedron 3d printed The four puzzle pieces.

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The four puzzle pieces.
Interlocking Tetrahedron 3d printed The four puzzle pieces.
Interlocking Tetrahedron 3d printed The four puzzle pieces.

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Interlocking Tetrahedron 3d printed The assembled puzzle.
Interlocking Tetrahedron 3d printed The assembled puzzle.

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Interlocking Tetrahedron 3d printed Interlocking tetrahedron, screwy octahedron, two-piece pyramid.
Interlocking Tetrahedron 3d printed Interlocking tetrahedron, screwy octahedron, two-piece pyramid.

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Interlocking Tetrahedron 3d printed Four sizes of interlocking tetrahedra.
Interlocking Tetrahedron 3d printed Four sizes of interlocking tetrahedra.

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Interlocking Tetrahedron 3d printed Three colors of interlocking tetrahedra.
Interlocking Tetrahedron 3d printed Three colors of interlocking tetrahedra.

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Interlocking Tetrahedron 3d printed
Interlocking Tetrahedron 3d printed

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Not a Photo

Interlocking Tetrahedron

Made by
$20.00
3D printed in dark purple, richly colored nylon plastic with a smooth finish.
QTY
Product Description
This is my favorite pyramid design. Four puzzle pieces interlock into a 20-ball tetrahedron (or 3-sided pyramid). Assembly of this puzzle is very confusing. Even when you understand where the pieces go, you still have to figure out how to get them there. Assembly is only possible for pieces with a little bit of flex, as these plastic pieces have.

The final pyramid is very stable, must be pried apart. Made from 12mm diameter hollow spheres.

See http://home.comcast.net/~gibell/puzzles/IT/InterlockingTetra.html for hints and a solution page.

I have stiffened this version by increasing wall thickness.
Details
What's in the box:
Interlocking Tetrahedron
Dimensions:
8.82 x 7.97 x 2.03 cm
Switch to inches
3.47 x 3.14 x 0.8 inches
Switch to cm
Success Rate:
First To try.
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Rating:
Mature audiences only.
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