Volunteer dentists convert snorkel masks into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

A view shows snorkel masks to be converted into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

Volunteer dentists assemble snorkel masks and convert them into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

Volunteer dentists assemble snorkel masks and convert them into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina

A volunteer dentist works on converting a snorkel mask into a respirator, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina