An anonymous reader writes "Have you ever been sitting there, quietly computing something and thinking to yourself, 'If only this process were somehow billions of times slower, less reliable, and involved lots of physical labor?' If so, the Turbo Entabulator is the machine you've been looking for! It's a (nearly-entirely) 3D-printed mechanical computer. With three single-digit counters for memory, it's driven by a hand-cranked, Jacquard-style punch card reader. You can even download the files and build your own."