• Robert Downey Jr, Alex Pring

Robert Downey Jr, Alex Pring (Photo : www.apextribune.com)

Robert Downey Jr. met with a 7-year-old boy named Alex Pring, born with his right arm partially developed, in character as Iron Man to hand the boy his own Iron Man 3D printed prosthetic bionic arm.

"Honored to present a bionic #IronMan arm to Alex through@MSOneNote's #CollectiveProject. Check the bowtie. #dapper," Downey wrote on his Twitter video post.

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"Actually, I think yours might be better than mine," Downey Jr. "Dude, it's even cooler than I thought," he added while comparing their arms.

The arm was created by Albert Manero, a mechanical engineering student. He founded the Limbitless Solutions, a volunteer group, that builds affordable 3D printed, bionic arms for children.

The Limbitless Solutions is non-profit organization composed of engineering students from the University of Central Florida, who volunteered to sacrifice on coffee to save for the projects. Their specialization in designing 3D-printed limbs for children because according to them, kids will almost instantly outgrow expensive bionic limbs.

Each of the limbs cost $350, materials alone. They make use of a 3D printer from the University's laboratory and takes at least 30 hours to complete.

This Iron Man inspired limb, in particular, was created for Pring, who also received an Optimus Prime version at Christmas.

The "Sherlock Holmes" star's appearance comes days after the other Marvel superheroes Chris Pratt and Chris Evans visited the Seattle's Childrens Hospital, describing both as "true superheroes".

This 3D bionic arm donation is still part of the Microsoft's Collective Project in helping produce prosthetic limbs infinitely cooler and financially more practical than anything the history has discovered in the past.