Meet Zac Waters, the 13-year-old who spent 300 hrs 3D-printing wheelchair for a 21-month-old

A 13-year-old boy from Lehi, Utah, spent about 300 hours during his summer designing, printing, testing and assembling a custom mobility chair for a 21-month-old girl. Zac Waters found MakeGood, a nonprofit that provides free 3D-printed mobility devices, and used his interest in 3D printing to build a chair tailored to the toddler’s needs.