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I was involved in the early stages of the project, more specificity I designed the 3d printed stethoscope prototype:

https://journals.plos.org/plosone/article?id=10.1371/journal...

Happy to answer questions

What 3D printer and software did you use?

I got a prototype of the Lulzbot mini, which I used to print it (and I still have that printer!).

I designed it in a ruby thing that translates things into openscad (crystalscad was the name, but I deprecated it for multiple reasons. There's jenncad in my github repository as its successor, but I didn't have the chance to get it anywhere to stable)

Other software I used were printrun and slic3r.

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