I'm sure you've seen this already, but if not: https://www.youtube.com/watch?v=j9uRckJLqLk https://www.youtube.com/watch?v=j9uRckJLqLk A 3:1 scale replica of

I'm sure you've seen this already, but if not: https://www.youtube.com/watch?v=j9uRckJLqLk https://www.youtube.com/watch?v=j9uRckJLqLk A 3:1 scale replica of the Curta, 3D printed.