Cord Locks for Masks

thingiverse

These are cord locking beads of various sizes for use on the earloops of surgical masks or KN95s. I used a stiff piece of wire to push the earloops through the beads. The beads stay in place well as long as you use a small enough size to create sufficient friction. Bear in mind that if you modify a mask with these, it will invalidate any certifications the mask may have (N95, KN95, KF94, ASTM, etc.) and cannot be relied on to protect against COVID or for any other purpose.