It Took 297 Agonising Tries For This Complex Rube Goldberg Machine to Work Flawlessly

Between each attempt, all of the steps had to be rebuilt, reset, and re-assembled.

from gizmodo http://www.gizmodo.co.uk/2017/09/it-took-297-agonizing-tries-for-this-complex-rube-goldberg-machine-to-work-flawlessly/