Don't be fooled, the "specially engineered composite material" that the guy talks about is actually more similar to sugar cookie dough. It' made up of sugar, flour and a couple of other "secret" powders. And the binder material is Cyanoacrylate Adhesive (CA) glue. The parts that come off of these printers have no real structural strength, if you were to drop a metal wrench you could pick it up and still use it, don't try that with a 3D printed tool. I have a few ball bearings made from this stuff and though it is pretty cool I would never use a printed part in any kind of structure or vehicle.