The NASA wrench. Mine does not turn. This also my first time to use a jhead. It is an original not a knockoff and i must say it is great.
FYI I’ve printed two now (on my rep1) : Sliced one using makerware, and the other using Simplify3d, both pretty default prefs: the Makerware one was locked up (the S3d one worked immediately), but after putting on a socked and torquing on it, it broke free: just make sure to turn in the correct direction 
(counter clockwise if facing the shaft)
Does seam it would of been better to make this a multiple part ratchet and assemble it after.
Thanks @Eric_Pavey I used pliers and just a few times working it and it broke free.
@Alex_Lee Seams that way. Maybe it is a leading print for other stuff later.
am sure NASA would be interested to hear from anyone who could improve the design, personally I think its a good piece in showing kids design methods towards 3D printing. here my attempt https://www.youtube.com/watch?v=PZnzoVDnWyM&list=UUkRSFXk4COsIYs5XfMej7-A first piece for kids space tool box .
a wrench like that seems a bit ambitious for a first tool, kudos to them if it was actually usable, but a specialist sized/shaped spanner would have been so much easier and more reliable
It’s part one. Don’t forget, NASA has been raised on Federal acquisitions:
3DPW1: Wrench, 3lb/ft, for the doing up with. $37,855
3DPW2: Wrench, 3lb/ft, for the undoing with. $39,895
The reason the undoing one is more expensive - captive market. Now you have done it up, you are going to have to undo it at some stage… 