Microrobots for Inspection

More examples of very small scale solutions foor manufacturing, maintenance, inspection.

Harvard's sticky-footed inspection robot can climb through jet engines
By Michael Irving in NewAtlas

It's tricky to routinely inspect jet engines and other machines without taking them apart, which is a costly and time-consuming process. Now, a team at Harvard's Wyss Institute has developed small, insect-like robots that can climb inside and through machines to inspect them, saving the trouble of pulling them apart if there's nothing that needs fixing. .... " 

Further technical details.