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Table 4 Alternative mask and mask frame design solutions developed to address shortages in N95-tyle masks caused by the COVID pandemic

From: 3D Printed frames to enable reuse and improve the fit of N95 and KN95 respirators

Design Name Description Fit Testing Data Available
Copper3D NanoHack De-novo mask design. 3D printed mask with filter media made of non-woven polypropylene impregnated with 5% copper oxide particles. No [31]
HEPA Mask De-novo mask design. 3D printed mask to house commercial HEPA filter insert. No [32]
Injection Molded Autoclavable, Scalable, Conformable (iMASC) system De-novo mask design. Liquid silicone rubber mask using filters cut from 3M 1860 N95 FFRs. Yes [38]
Lowell Makes Mask De-novo mask design. 3D printed mask with customizable filter insert.   No [33]
WASP My Face MaskBellus 3D De-novo mask design. 3D printed mask with customizable filter insert.  No [34]
Bellus 3D Mask frame design. Rigid 3D printed mask frame that fits over existing mask; uses picture of user’s face to personalize printed design. No [35]
Double Eight Masks Brace Mask frame design. Rubber band brace used over existing surgical mask. Yes [39]
PanFab Mask Frame Mask frame in two sizes for use with multiple models of N95 and KN95 masks to replace defective straps or damaged nose pieces. Yes (this work)