CONJOINED twin boys have been successfully separated after a remarkable twelve-hour operation using 3D printer technology. Medics in China worked tirelessly to separate five-month-old twins Yu Ce Yuan and Yu Ce Xiang - known as James and Harley - who were joined at the abdomen. The surgery, on February 24, was made possible by the generosity of strangers around the world who donated $60,000 to cover the cost of the operation. The twins’ 20-year-old parents Yu Dang and Zhou Li travelled over 1,000 miles from their home in the rural, mountainous Guizhou province to Children's Hospital of Fudan University in Shanghai for treatment.