Watching a 3D printer work always reminds us of watching a baker decorate a cake. Gooey icing squeezes out of a nozzle and makes interesting shapes and designs. While hot plastic doesn’t taste as good ...

Even if you don’t cast or forge metal yourself, you’re probably aware that you need to get the material very, very hot to make that happen. While some smiths might still stoke coal fires, that’s a ...