Modeling COX engines with 3D Printer

Hey Jose.
I didn't even know I had a 3D application on my computer until, out of curiosity, I downloaded your Tee Dee venturi and double clicked it, and voila! What a surprise.

How far are we from having affordable personal 3D printers that will integrate multiple metals and polymers? Just keep the hoppers full and e-mail, for instance, a new pair of shoes, or prescription glasses to a customer. At least in a pre-finishing/polishing form. It seems like it will be a revolution in industrial sharing of parts, prototypes, etc. The ISS is doing it more and more.

The Only Star Trek series that ever addressed resupplying their replicator stock was Voyager(my favorite of all the ST series). Captain Janeway would harvest basic materials for food and hardware from nebulae. "There's coffee in that there nebula," she'd say. But aside from the living organic products they replicated, we seem pretty darn close to wide scale use of such technology.
Rusty