I really liked Knekkebjoern's storage boxes (https://www.thingiverse.com/thing:2705022) but they didn't really work for me. So I've created storage boxes with exact spaces for each monster. I've also grouped monsters so you have less boxes. I've tried to group the monsters as logical as possible or to limit the amount of required boxes. There are 10 in total.
Edit: Bosses are now done as well. In the photograph there are no indents for taking the monsters out, I've fixed that in stl files.
Edit2: I've finally finished all the containers for the rest of the material including a customizable box for the cards (slits and dividers) and several containers for the tokens, overlays, money, etc.
Edit3: The divider (that go into the slits of the card box) both (long and short) have two versions: tight and loose: these are two different lengths which depending on your printer work best. You'll have to check which suites best.
The HEX adapter you find amongst the files is not required, I noticed that with one hex box the tokens fell out (hole too large) so created the adapter to fill it up. But I later fixed this issue. Still, if you're planning to do other stuff with the boxes than initially intended it could be useful.
To keep things a bit clear, I've renamed all the files so there more easy to find.
In case you're wonder what the (excel) list is among the pictures: its an overview of which monsters go together in one box.
And that means that I'm done. Perhaps I'll find some other things to tinker with, but this now is a full storage solution for gloomhaven.
I've added the Fusion 360 files as well, so other can improve change as they seem fit. Some reference to my work though would be appreciated.
As for that matter: there's one file with '(not mine)' in the title, that is created by: Noggog, I've added it to my files for completeness. (s)he based this on a container of directsun, but I've recreated that box and made a tiny improvement.