This self-taught 26-year-old made 3D-printed prosthetics for the world's poorest countries. Now he's making masks to help combat the COVID-19 crisis.

6:19am PDT - April 16th, 2020    bill gates - Business Insider

Business Insider España Industrial engineer Guillermo Martinez had always been curious about the world of 3D printing. He finally bought his own printer in 2017 and started watching YouTube tutorials on building robots for fun. A year or two later, Martínez f…