Remixed NASA Wrench
I really thought the first 3D printed object in space was cool, but I thought it'd be better if you could both tighten and lossen bolts/screws with it. In TinkerCad I simply cut off the end then mirror copied the main part. I added a T (Tighten) and L (Loosen) to each side so you know which side is which.
Let me know how your prints come out, mine didnt come out great the first time.
Thanks!