By Esther MAMANI As a kid growing up in poverty in rural Bolivia, Roly Mamani built his own toys. Now a 34-year-old engineer, he 3D prints limbs for Indigenous compatriots scarred by life-changing accidents. Mamani funds the endeavor with the money he makes from selling robotic toys he makes — his other passion, which, after building his first remote-controlled toy car as a child, he never abandoned. Surrounded by prostheses, plants and 3D-printed dinosaurs in […]