This was inspired by a /u/LemonStream's design on reddit but modified a bit for my own uses.
First I've added a second row for dice as I always bring two sets.
Second is I've added a miniature base cutout in the pen holder that can be used to store some slim minatures inside the dice tray portion of the case.
It uses 13 neodymium magnets (6x3) that I got off amazon. I've made the holes 3.2mm deep and added a tiny 65-degree chamfer which makes it easier to set in.
I didn't notice but apparently, someone else beat me to putting up a design here on thingiverse but I still like mine and think some may enjoy it. Mine does lack the inlay used by the linked case.
SUNLU PLA Plus
You can print this in anything but I think wood truly looks the best.