You might also like these free designs!
* Pencil Icosahedron: https://www.myminifactory.com/object/3d-print-83586
* Bone Nautilus: https://www.myminifactory.com/object/3d-print-54588
* Fractal Snowflake: https://www.myminifactory.com/object/3d-print-73350
* Octahedron Beads: https://www.myminifactory.com/object/3d-print-73737
* Icosahedron Beads: https://www.myminifactory.com/object/3d-print-73736
* Dodecahedron Beads: https://www.myminifactory.com/object/3d-print-73498
* Lattice Bowl: https://www.myminifactory.com/object/3d-print-53755
One thing I really love about 3D printing is that we can create things that are just for fun, and 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 end result would be robust. Maybe I should do the other Platonic solids, too...
So, you'll notice there's a test file in there, and it's simply one of the face corners. What I'd suggest is that you print five of those, along with a nut and bolt, and just test that your print assembles nicely. 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