I'd intended to design it so the parts could only be put together in one specific sequence, but testing the new model revealed a slight flaw: one of the pieces could be put on (or taken off) out-of-sequence because I'd only blocked movement in one of the two directions it might move. I probably wouldn't have discovered the oversight without building these test models.
Here's a movie demonstrating how the puzzle works and revealing the design oversight.
One of the pieces had some exceptionally thin edges, which came out kind of wispy the first time so I tried building it in a horizontal orientation for comparison. The new orientation is probably a bit stronger, but the difference isn't compelling. Both parts work about the same.
I will probably start over from scratch because of the thin walls and un-blocked movements, but I consider it a very successful experiment nevertheless.
I'm so glad you put those together wrong Scott. I'm feeling much better about making the same sorts of mistakes. I don't really understand why it is too thin though.
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