square clip for shoelace
thingiverse
original design 4285393 (https://www.thingiverse.com/thing:4285393) is fine, bought face masks made with shoelaces instead of elastic bands (what's a smart idea!) the ends pass the first large nut but not the other two inspired by this I design I made slots of 3.5mm width a simple scaling seemed to be too large at all just to get the 2nd and 3rd slot more of width
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