https://theawesomer.com/photos/2026/06/3d_printed_mechanical_calculator_t.jpg
The Odhner Arithmometer was a 19th-century mechanical calculator. Inspired by its pinwheel mechanisms, Matthew Lim made a modern version of the calculator using 3D-printed parts. It uses gears, dials, and a crank to perform addition, subtraction, multiplication, and division without electronics. Buy the STLs and instructions to make your own on Patreon.
The Awesomer