The NASA “Space-Wrench”. http://www.nasa.gov/mission_pages/station/research/news/3Dratchet_wrench My 1st print from a downloaded file. I’m happy with the results; considering I have made no adjustments to my kit-built Printrbot Simple Metal other than the initial Z-axis calibration. Lots more to learn …
This wrench is the NASA wrench. It was the 1st tool to be emailed off planet with a function. I’m not sure if it completed the task it was created for, but it was sent with that in mind. The ones I’ve printed do function and ratchet. I’ve never tried to do up a bolt with it but do expect it will work.