Fun with geometry! This is a framework icosahedron that assembles with nuts and bolts!
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updated June 18, 2023

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One thing I really love about 3D printing is that we can create things which simply wouldn't otherwise exist - like this!  It's a screw-together icosahedral ball, and assembly is half the fun.  It was a great puzzle to work out how to approach this and keep it printable without supports, and make sure the result would be robust!

You'll notice there's a test file in there, and it's simply one of the face corners.  I'd suggest printing five of those, along with a nut and bolt, and just test that it assembles nicely with your print settings.  It's a quicky and easy way to get things perfect before printing all the major parts.

For the whole ball, you'll need to print:

* 20 faces

* 12 nuts

* 12 bolts

Have fun!

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