A 17-year-old Indian-origin boy has developed a low-cost 3D-printed robotic arm, which is programmed to replicate movements of a human hand such as pinching, grabbing or holding a spoon. Nilay Mehta, student of the Irvine High School in California, US, has won six science fair awards so far for his creation, including third place at an international fair held earlier this year.Mehta said that high-end prosthetic arms cost upward of Rs 22 lakh. Motors and 3D-printed parts used to make his arm added up to about around Rs 16 thousand.