Printing magnets in complex ways that create polarity that has breakthrough applications. This stuff is relatively untouched. The spring in the 2nd video is absolutely mind blowing. But the gears in the first one are the tl;dr…. how about a transmission that never wears out?
he talks gears at this link:
https://youtu.be/drD416THU7Y?t=1m4s
For lots more: