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Maybe have a look at the Curta for inspiration of a mechanical calculator. There's a 3D printable version of it.

https://www.youtube.com/watch?v=j9uRckJLqLk https://wudev.digitaltorque.com/articles/curta-1/

He mentions curta in the fourth paragraph, and also having a simple design as one of the goals.

Curta is over complicated. I eould rather focus on a design thats easily made with plywood and common wood tools.

Complex, but as far as mechanical calculators go AFAIK not over complicated. Or is there a simpler mechanical calculator design that packs the same functionality in such a handy package?

I would forgo handy package part. I think someone built a 3d printed Curta and it turned out 3-4 times the size of the original so much for being "handy". Maybe we should try a Odhner or Brunsviga or some other design.

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