You would need a ceramic mold, but that might be easier to 3d print? Right now it is in a bed of fine glass beads that the printer drags through as it goes, so

You would need a ceramic mold, but that might be easier to 3d print? Right now it is in a bed of fine glass beads that the printer drags through as it goes, so this is kind of a similar approach. For one offs or prototypes this might be good, but when you print more than one of something than a mold likely makes more sense.