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a 2-piece puzzle containing two identical pieces that, once assembled, form a tetrahedron
Although this piece is bit different, credits need to go to Rinus Roelofs, who makes a lot of mathematical art objects with 3d printing. see www.rinusroelofs.nl
I printed them with Cura 13.06.4 using the default setting "fast" with support, although support might not be necessary. Some slight cleanup/grinding was needed.
Although it seems dead simple to assemble, it appears a challenge for most people that tried...