Factories already use robots that can repair themselves, and we aren’t too far from self-healing materials. From Popsci:

“Self-healing materials will eventually fix anything from cell phone screens to car fenders, enabling surfaces to heal on their own in the presence of different types of light. But none of the earlier prototypes we’ve seen work quite like this new plastic: It bleeds red at the site of injury. Then it heals itself, inspired by the properties of tree trunks and human skin.

Marek W. Urban from the University of Southern Mississippi presented a paper on his new co-polymer at the American Chemical Society’s national meeting in San Diego Monday. When it scratches or tears, a red splotch forms around the ‘wound,’ marking the site.”