The limb took seven weeks for the team to build in their free time and cost $350 compared to the $40,000 that doctors told Alex抯 family a prosthetic arm would cost. After the little boy put on the arm, which senses muscles in his shoulder and opens and clnoses, he grinned and gave his mother a hug — the first time he had been able to put two arms around her.

　　?I feel good,” Alex told reporters. “I feel everything good, even my robot arm. It’s not even heavy.” Because Alex had been born without an arm, the insurance company wouldn’t cover the costs of the prosthetic arm. The costs are so steep for childhood prosthetics because of children’s quick rate of growth and the need to always be replacing the limbs.

　　Manero was driving his car when he heard a story on the radio about a man in South Africa who used a 3D printer to make a new hand. “I was really inspired,” he said. “When I got back, I talked to my colleagues and friends and said, ‘We can do this’”.

　　The team梚ncluding friends who study electrical, mechanical and civil engineering梘ot to work on the arm, which wexas activated by the electromyography

　　(肌电图) muscle energy on Alex’s bicep (二头肌) , UCF Today reported. Manero, a Fulbright Scholar, heads to Germany in August to work for the German Aerospace Center, but he has already promised to help another family with an arm, so he’ll remain committed to the project even when he’s abroad.

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