I've owned some pretty unreliable printers, and I'll leave it at that... This design comes from the need to have a 3D printer that is reliable, period. I didn't have the money for a several thousand dollar 3d printer with an equivalent build area so that was out of the question. Plus as a fledgling Engineer, I really wanted to blood myself on a project. And that's how Old Faithful came to be. A simple, reliable, rigid, durable machine. Made by me :) Also, it'll be tough enough for light CNC.