Hospitals and medical facilities around the United States are reporting critical shortages of the protective equipment they need to keep their workers and patients safe, so some DIYers are coming up with homemade solutions to help fill the void. In Billings, Montana, some healthcare professionals are using 3D printers to make reusable plastic face masks. The masks are then fitted with pieces of surgical masks which can be swapped out as needed. The Zauggs have four 3D printers, Richardson said, and have cranked out at least 15 masks so far. Billings Public Schools are closed because of the coronavirus, but some teachers went back into their classrooms on Monday to start printing out masks on their schools’ machines. Libraries across the state will also print the masks along with Montana State University Billings and Rocky Mountain College.