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After making about half of this model, using only the externally
visible parts, I noticed it was quite flexible. I printed out some
decagrams, matching in size to the decagram you get when you take a
cross-section right through the centre of the model.
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A number of decagram parts can be glued inside to the existing internal
tabs. Finally I glued a whole decagram (with a hole in the middle to
get tweezers through) under the free tabs around the rim of the first
half of the model.
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Rather than figure out how to put the last part in, I made two complete
halves of this model as described above. Then I just glued the two
halves together. It's hard to tell where the join is now. I'm a bit
surprised this worked so well!
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You can see roughly how big the model is here.
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Here is a very small version of the model made using SLA rapid
prototyping, along with a model of its dual.
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Great Icosidodecahedron
