My Mom likes to keep her car keys attached to her handbag. The cheap key rings were short lived and hard for her to unhook when she needed to take them off the hand bag. This will hold together as the stresses are redirected off the magnets. Pulling directly apart releases the clasp. Printed PLA .20 3 walls like everything I print, 20% infill. Just pretty standard settings all the way around. I super glue the magnets; marking the backs so oriented properly when I drop them into respective spaces. Tight knots in the paracord so they tuck into they funnel shaped holes.
Magnets - https://www.harborfreight.com/10-piece-rare-earth-magnets-67488.html
The author hasn't provided the model origin yet.