He is now determined to play the cello and teach himself how to write with his right hand.
The bionic arm replaces a basic prosthesis with a moving thumb.
"I couldn't grip a pencil before,'' he said.
The arm was built in Orlando, using pictures of Corey's right arm.
But on arrival in Dunedin, Mr Manero discovered the arm had more muscle than expected.
"Our sizing was off by 10%. When we got here, we found out he was a little bit stronger and had larger muscles than expected and we had to do some work with Otago Polytechnic in their design lab to ensure a comfortable fit.''
The material to build the arm cost about $485 but families were given the finished product free of charge.
"Hopefully, it helps him with the little things in everyday life ... things we take for granted,'' Mr Manero said.
Mr Manero will give a talk - "Making a Difference - Using 3-D Technology to Change Lives'' - at the New Zealand International Science Festival event at the University of Otago tonight.