A quick googling showed that there are already 3D ceramic printers, seems like it would be an easy conversion to use refractory ceramic mixes, but what seems easy to the layman can be a nightmare to the engineer. Anyone have more experience with these printers, specifically with using ceramics? I'm sure that at the moment making forms and casting is cheaper, but it seems like 3D printing tech is receiving a lot of attention so the potential for cheap 3D printers in the near future is pretty high.
Imagine being able to download open source or low cost plans that you then took to your local industrial 3D printer who you pay a fee to to print up your new core.
"Instead of Pay It Forward I prefer Plant It Forward" ~Howard Story / "God has cared for these trees, saved them from drought, disease, avalanches, and a thousand tempests and floods. But he cannot save them from fools." ~John Muir