A 13-year-old boy could have spent his summer doing what many kids his age do, but instead, Zac Waters spent nearly 300 hours using his 3D printing skills to build something that could make a little girl’s life better.

Waters, from Lehi, Utah, became fascinated with 3D printing after watching a YouTube channel about the technology. But he wanted to do more than simply make cool things.

He discovered MakeGood, a nonprofit that creates 3D-printed assistive devices for people with disabilities, and found the perfect way to combine his passion with his desire to help others.

His summer project was a custom wheelchair designed for a 21-month-old girl.

Waters spent roughly 300 hours designing, printing, testing, and assembling the chair. He also made sure it included features that could make a real difference for the toddler and her family.