I decided to make this mask and filter and then upload them and its awesome you take a clinic mask and cut it in to 2.5 in squares and insert into the filter then attach the filter to the mask its awesome. to hold it on your face you can use elastic and rubber bands. best print material is pla material. it dont change size of mask if its for an adult. if its for a child then scale it down to 90%. printing just the mask it takes 5 hours and 52 minutes. printing just the filter it takes 50 mintues. it takes 6 hours and 45 mintues to print both at the same time.