had a bunch of keys to dispose of, so we thought we'd see if it would be reasonable to cast something out of them. At the +Omaha Maker Group
I used our 3D printer to make some ABS Teddy Roosevelt busts (thanks Thingiverse!) to use for plaster investment casting (going to try melting out the ABS with acetone before casting), and last night we threw the keys into a makeshift furnace and cast a tiny ingot with them. It worked out well enough that I think we can go ahead and scale up. We'll probably cast the keys to ingots just to clean it up (it makes a fair amount of slag, we suppose from the oxidation on the surface of the keys), and then we'll try casting some Teddy Roosevelt busts.