A number of years ago at Siggraph and the now defunct 3dExpo I watched a number of these things work, although they weren't as advanced as the one in the link (for example, they only produced models in single colors). In those cases the majority used a cornstarch based powder and an non-toxic 'glue', so while they probably wouldn't taste good, you could eat your models if you really wanted to. Somewhere around here I have a spinning ball baring wheel that I watched being made as a sample.
Other versions had more constraints but used different materials such as a hard-wax and even wood (in that case the model was split apart into pieces the machine could handle by the computer and then had to be glued together after it was out of the machine).
We've got one where I work. It builds some pretty cool stuff.
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Through with oligarchy? Ready to get the money out of politics? Want real progressives in office who will work for the people and not the donors? Want to help grow The Squad?
3D Printing.
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