Awesome 3D printed Robot drivetrain. Great show of how 3D printing can be useful for stuff other than vases. 
https://www.youtube.com/watch?v=BXWazjMG0mQ
I’ve just got to start printing other than printer stuff. I’m trying to further the technology but that’s pointless when I’m not validating it’s every day application usefulness.
I was reminded just this Christmas of an around the house use that I had completely forgotten about. My mom had a new electric screw press for butter cookies that used large round plates. She also had a large library of plates for an older hand cranked machine that used smaller notched plates that would simply fall through the opening on the new machine. So a year ago, I had printed an adapter that let her use the smaller plates in the new machine. It was still in the box with the plates, and worked just as well this year.
Awsome!!