Yet another shoelaces clips

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 easily with one hand.
https://youtu.be/ek1gth_6b2Y
https://youtu.be/0oyCW-pA9bQ
You can find a printed product here http://shpws.me/Qrmt

Inspired by https://www.thingiverse.com/thing:2238530 I designed my version. 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.
Also, it was the baseline for next revision - https://www.thingiverse.com/thing:2891497

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_p1xxx)
- on height 8.2mm and 8.8mm for part 2 (aShoeKlips3_p2xxx)

Update:
05.05.2018 Added revision D for better bridges slicing. Check images.
Also rev D has 0.6 chamfer for top hol