Not a ratchet wrench. It’s a short breaker bar shaped like a ratchet wrench. There is no moving parts in it. And I’m sure it will likely strip or break after any serious use. Purely a NASA PR stunt.
Maybe. I've been experimenting with 3D printers, I own two. PLA is the rage for making toys, but i found it fragile. ABS is better and more flexible, but I still had problems with some parts breaking under stress. I find that nylon is stronger and more durable. I join metal components with the nylon to create very strong tools. The parts are designed with holes and slots for the metal. Then I insert steel or aluminum rivet nuts and bolts. You can twist and flex the nylon and it won't break, unlike ABS plastic. I also use sheet metal, cutting and bending to suit the parts I need.
In time, NASA will beef up the 3D tools and machines for space, and it will be very successful. The only problem is that the Chinese may get it done first.