TPU hinges

I'm an instruction librarian who works in a Makerspace. A book art librarian shared Tom's Orihon with me years ago, and I thought it would work really well as an assignment for the right class.
- I modified the pivot hinge to two files that can be printed with our dual-material Ulitmaker 3. The TPU is sandwiched inside the PLA, allowing the book to act like a traditional codex format.
- I recessed the pins to make adding/removing plates easier.
- I have no plans to make a hinge for more plates, but if the desire is there I probably could.

The animated gif has no mounting pins, just to show the hinge flex.
**Dry filament is crucial for this print to work!! Damp PLA will cause the pins to snap at their base, and damp TPU is simply a nightmare in and of itself.

Thank you so so much to Tom for this original idea.