Three-year-old Rayden Kahae wanted an "Iron Man" hand, and last week he got it.

The Maui boy, called "Bubba" by his family, was born with amniotic band syndrome, which left him without a right hand. Although he did fine with just one hand, his grandmother Rulan Waikiki told Hawaii's KHON that when Rayden noticed his little sister had two, he wanted another like hers.

A prosthetic hand can cost as much as $40,000, and a growing boy like Rayden would have to be refitted regularly. However, several months ago, Waikiki made a discovery online: Thanks to 3D-printing technology, a mechanical hand could be constructed for just $50. And with help from e-NABLE -- "A network of passionate volunteers using 3D printing to give the world a 'Helping Hand'" -- Rayden's Iron Man hand didn't cost his family a penny.

It's even red and gold.

The arrival of the new hand was captured on video, which you can see below. “As soon as he put it on and was able to close the hand, his face just lit up,” Waikiki told KHON. “I’m not sure if the video, you can hear it on there, but he does say, ‘I can hold my own hand.'"