A child tries a 3D printing pen during a visit to an interactive museum for 3D printing in Yantai, east China's Shandong Province, Dec. 10, 2016. (Xinhua/Tang Ke)
A child tries a 3D printing pen during a visit to an interactive museum for 3D printing in Yantai, east China's Shandong Province, Dec. 10, 2016. (Xinhua/Tang Ke)