Link: https://www.youtube.com/watch?v=IANBoybVApQ

These are called "Polymagnets" or "Programmable Magnets" or "Printable Magnets" or "Printed Magnets".

Here's the Polymagnet homepage: http://www.polymagnet.com/

The magnet I used in the pull test demo was part number 1000425. You can find it in the interactive catalog here: http://catalog.polymagnet.com/
Two amazing discoveries in a week! [first one here]

This one looks like a game-changer in manufacturing...