Fig. 1
From: 3D Printed frames to enable reuse and improve the fit of N95 and KN95 respirators
Mask frame components. a PLA lateral frames in two sizes: the small size is 6.35 cm long and regular size is 7.62 cm long. b and c Assembled mask frames consisting of both mask frame and malleable wire (copper, steel, or aluminum). Note that this mask frame involves attaching 3D printed components to wire using cyanoacrylate “super glue”. A mechanical attachment method is described in Fig. 2