How It’s Made is a TV series on the Discovery Channel that’s been on for more than 10 years. You can see the videos on this site: How It’s Made. Here’s the one on 3D printers (will open in a new window):
Some of the many, many things explained:
- Frying pans
- Top Ten Favorite Foods
- Aluminum baseball bats
- Pencil sharpeners
- Ski bindings
And there’s even a “How It’s Made” article about “How It’s Made” — from the Atlantic.
This site is good for listening practice, and it may even inspire you to make your own “How It’s Made” explainer video.