I'm watching carefully to see if/when the technology leaps from plastic to other substrates.

We already see hints of it with the newer 3D food printers (gimmicky?), and the mill/engraver units like Boxzy: https://www.kickstarter.com/projects...-engraver-3d-p .

If it does, the guys gaining experience with plastic printers now will have a first mover advantage.