Apparently not, though, as [NightHawkInLight] reveals his trivially easy method for making synthetic rubies. Like their gemstone cousin the sapphire, rubies are just a variety of corundum ...
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 ...