A Groveland boy’s 'Iron Man' prosthetic arm has been seen around the world thanks to viral video of him and Robert Downey Jr.

On Monday, that boy, Alex Pring, was at the University of Central Florida for a big announcement. He was joined by a Vero Beach boy, Wyatt Falardo, who also got a big surprise.

Both boys have one-of- a-kind prosthetic arms made on a 3-D printer by UCF students and their non-profit, Limbitless Solutions.

Pring wasn’t shy about showing the best part of his “Ironman” prosthetic arm.

“My favorite part of the arm is the bend and this right here [showing a light in the palm] But the favorite, the really good favorite part is all the stuff inside, all the technology and stuff,” said Pring.

Falardo also loves the technology of his 3-D printed arm.

“It’s awesome. Its computer science and all that kind of stuff. This rocks,” said Falardo.

The blue of Wyatt’s prosthetic arm is a tribute to his favorite act: the Blue Man group.

The group surprised him at a news conference Monday morning at UCF.

John Sparkman is a UCF student and the Director of Research and Development for Limbitless Solutions.  He’s also a co-founder of the non-profit.

“We don’t want any child to pay for it. So we want to give every arm for free to the children,” said Sparkman.

That’s where the new partnership between UCF and Limbitless comes in. The non-profit is made up of all student volunteers who developed the arm technology. Limbitless started with about 15 student volunteers, now it’s up to 60 or so.

The new partnership called “CABAM” establishes a research facility that combines knowledge and talent from several disciplines to develop more obtainable “biomedical” products, like the Ironman and Blue Man prosthetic arms that Alex and Wyatt so proudly model.

“At first, they’re always getting questions like, 'what happened to your arm? Did it get bit off by a shark?' And now they’re getting questions like 'what a cool arm. Hey, can I touch it? How does it work?'” said Sparkman.

Up until this point all the materials that went into making 3-D printer prosthetic arms had been donated. That includes access to 3-D printers. The maximum cost to make each arm is about $350.

Also, Limbitless is not limiting itself to prosthetic arms. It’s working on a leg right now and is in talks with the Veteran’s Administration to eventually, possibly develop limbs for soldiers injured in war.