Alex is a seven-year old boy who was born with one of his arms partially developed . Ordinarily, getting a prosthetic arm for a boy who will have to have them replaced periodically would cost thousands of dollars. But a non-profit called Limbitless Solutions, created by a college graduate student named Albert Monero, has developed 3D printing and volunteer labor to bring the price down to the low hundreds of dollars.
The arm seems to have great freedom of movement, with the fingers being able to flex and grip objects. The 3D printing technology means that as Alex continues to grow, larger and more sophisticated versions of the arm can be fitted for him easily and cheaply.
When Alex is fully grown, considering the remarkable advances in the technology, the prosthetic arm he will wear will likely be light years ahead of the capabilities that his Iron Man arm has currently. But one cannot doubt that he will remember forever the day Tony Stark personally presented him with his very first one.