Developer demonstrates process of making respirators by using 3D priniting technology in Prague

Photo taken on March 26, 2020 shows a respirator made by using 3D priniting technology in Prague, the Czech Republic. Facing the shortage of masks in the Czech Republic due to the spread of COVID-19, Czech Technical University in Prague developed a new type of respirator that can be produced by 3D printing technology. (Photo by Dana Kesnerova/Xinhua)