"Thanks for the article. This is a great illustration of the potential for additive manufacturing to augment, rather than replace, existing methods of manufacture. Before launching the Fourneau Bread Oven in '15 we made our iron prototypes in 3d printed sand molds. A quick video on our blog shows a bunch of views of those molds: (https://www.fourneauoven.com/blogs/news/17820381-prototyping-the-fourneau-bread-oven) Anyone interested in trying out the technique should look up Hoosier Pattern in Decatur, Indiana – we've worked with them for all of our prototype molds. (https://hoosierpattern.com/)"