Hawkes: Justin VanderHeyden printed a gun.
Jo: He what?
Hawkes: Yeah. It's called 3-D metal printing, and it works just like any ordinary printer, but instead of using ink to produce an image...
Mac: It uses powdered metals.
Hawkes: Yes. Mixed with steel epoxy resin to create multiple layers of a three-dimensional object.
Jo: Okay, I'm not sure I even want to try to wrap my brain around that.