With sprinting events at the elite level decided by fractions of a second, athletes are always on the lookout for anything that can provide even the smallest advantage over their rivals. We recently looked at Nike’s Pro TurboSpeed suit that is claimed to cut down a runner’s wind resistance by using golf ball-like dimples, but footwear plays an equally, if not more, important role in an athlete’s performance. Now French engineer and designer Luc Fusaro has employed 3D printing technology to create lightweight sprint shoes that are customized for individual athletes that could prove the difference between winning and losing.