I really liked the design of the original with usage of strong magnets to close. But, it was 20m too deep for a kids mouthguard. It still fit of course, just too large. I'm cut it apart to shorten by about 19mm which fits the kids size a bit better.
Magnets sizes are still the same along with original width.
For print settings, this printed nicely at .25mm, 10% infill, and 4 perimeter walls. No supports or brim.
Note that the second picture has both this version (in Red) and the original (Gold) for size comparison.
The author remixed this model.
Approximately 38mmm shorter (19 per side) than the originally to better fit a smaller kids mouthguard.