Shoe (or Boot) laces thing

thingiverse

v2 is an all around improvement, see it here: https://www.thingiverse.com/thing:4825022 Back in 2019 I broke a boot lace with only an hour before I had to leave for a meeting, so I figured I'd print something up to replace it. Printed in TPU at 50% infill, they've lasted 18 months with only having 1 (out of 18) break due to poor layer adhesion. These range in size from 25mm to 50mm body width, print however many of the sizes you need.