Use shoe clips to easily and quickly secure shoelaces without needing to tie or untie knots. The clip together easily with one hand and also release e...asily with one hand. https://youtu.be/ek1gth_6b2Y
The main idea was to tune it for easy release and remove sharp edges. And I did it - even my 4-year son can open/close it
The second idea was to make it more stylish and use dual color.
While printing it is recommended do not use supports just bridging. For dual color print I changed color:
on height 5.2mm and 5.8mm for part 1 (aShoeKlips3_p1c)
on height 8.2mm and 8.8mm for part 2 (aShoeKlips3_p2b)