27-year-old industrial engineer Guillermo Martinez started making 3D-printed prosthetics in 2017. However, the day Martinez day watched a tutorial for a prosthetic hand would change his life forever. These are the 3D prostheses Martínez makes. Business Insider EspañaHe knew he had to get a move on if he wanted to pursue the initiative so he began talking to the press. "Thanks to the media, more and more emails turned up in my inbox asking for 3D prostheses.

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