Fig. 2
From: 3D Printed frames to enable reuse and improve the fit of N95 and KN95 respirators
Methods for mask frame assembly. a Method 1 for mask frame assembly utilizing glue adhesive. (1) One drop of cyanoacrylate super glue is placed into the end slot for the wire within the PLA lateral frame. (2) The end of a wire is inserted into the slot. (3) All four wire ends are inserted into the PLA slots as shown to complete the frame. b Method 2 for mask frame assembly using wire alone (no adhesive). (1) Wire is pushed through the opening in the PLA lateral frame. (2) The wire is looped back and (3) twisted around itself using pliers. (4) This process is repeated for each of the four total connections