More of a PR proof-of-concept stunt at this point. Unless it's a part or device that's not subject to a lot of tensile stress.
A socket wrench printed out of PLA or ABS will obviously just twist, bend, or shear at any amount of torque greater than if you could just turn the nut or bolt by hand to begin with.
But it's a start.
Get a metal sintering printer up there, or when someone figures out how to add meaningful carbon or glass-fiber reinforcement... which they eventually will, it's going to be great stuff.
IIRC, there's already some ideas for 3D printing entire moon bases out of lunar dust/regolith, and fusing/extruding it using focused sunlight to melt it into lava first.