I think most 3D printers are food safe technically, as they get really hot, which should kill the bad stuff. I haven’t looked into the chocolate printers, but I’ve got to imagine it works pretty similarly to a standard 3D printer: nozzle gets very hot and you just insert “filament” rolls or cartridges made of chocolate instead of plastic. A meat printer would need to do a lot more, if you’re talking just completely making meat from scratch. Would be awesome, but I think we’ve still got a ways to go before those are consumer friendly.