Before we introduce some super hero inspired mask files, we wanted to make this essential file available to the public as fast as possible so that you can help those who need one. Download link: https://drive.google.com/open?id=1hFYnULOostlD_oxzllC1FFS6bmRQA20w License: (CC BY-NC-ND 4.0) You can install N95 or PM2.5 filters after the mask gets printed. However just like all other masks are saying, misuse of this mask can cause you a serious harm. Please let us know your question by commenting below or Email: email@example.com. Thank you!