24 year old makes free 3D printed prosthetic limbs for the disabled

 24 year old industrial engineer Guillermo Martinez, worked in a toy shop, developing and selling toys. When he first bought a 3D printer, it was purely for entertainment purposes. He would go through YouTube tutorials on building robots and gadgets and enjoyed making this. The world changed for him the day he came across a tutorial showing how to build a prosthetic limb. 

"I started making many 3D-printed hand prostheses for fun. Then I thought to myself, 'what if this can actually...