Bellus3Ds Face Mask Fitter is a plastic frame that helps to improve the seal with surgical masks or similar face masks. It is made using a Bellus3D face scan (created with the Bellus3D FaceApp) and a 3D printer to precisely fit a persons facial geometry.The Mask Fitter was tested by the Loma Linda University School of Denistry.  Here is what they found: https://desk.zoho.com/portal/bellus3d/kb/articles/statement-from-loma-linda-university-school-of-dentistry-regarding-mask-fitterAttached is one example that fits about 15% of the population.  You can download the Bellus3D FaceApp (https://apps.apple.com/us/app/bellus3d-faceapp/id1352268131), scan your face and output a personalized STL to use on your 3D printer.  You dont need to create an account or pay to make your own, personalized Mask Fitter.Mask Fitter is a personalized device intended for use by individuals.  More information can be found here: https://bellus3d.com/solutions/facemask.html