A friend of mine is printing reusable masks for health professionals and rescue workers. If anyone with a printer is interested in doing this the link below has more information and the necessary files

Link

I printed one to check it out. Fits as well as a paper mask, I think. The 3 hour print estimate is a little low: it took my printer about 10 hours. I hear from some folks who are sewing masks that elastic is unobtainium.