This is a Remix of https://www.thingiverse.com/thing:1213127 by https://www.thingiverse.com/miketanct/about
Thanks to Mike Tan
I was print the original model 2 times.. but both of them broke during first or second use.
The old ones are gray the new ones are white.
Original and remixed part photos are added.
My idea is tie the laces from the bottom and do not use additional parts. Like on a photo.
I forgot to save an open scad file... but i got a screenshot for those who interested... sorry ;-)
I used ABS at 225C/100C
Brim of 10 rounds on 1st layer