This is a very simple but effective quick clip for you people out there making masks. God bless you, I hope this can help in some way. I designed this in Fusion 360.

Intention: To make a quick release/attach clip that is comfortable to operate and still completely adjustable

Please use this if it helps. I hope this small contribution can help those helping others.

I am using the Montana mask available here:

https://www.makethemasks.com/

I needed a quick release mechanism and I was inspired by my CPAP mask clip.

loop a cord through the large hole, then the small hole and back through the opposite side of the large hole (see picture), this way you can readjust if necessary. I use the polypropylene braided cord because rubber/elastic is difficult to find.

UPDATE V2:

main clip body modified

clip_a enlarged 10% for structural enhancement

Enlarge the body in your slicer for people with larger fingers!