UPDATE 07/07/2018: I've finally split the card tray, to allow for people with smaller printers to be able to print it. Just print two of them and you'll be good to go. Still working on making the token tray into smaller parts.
This War of Mine, the board game, is full of components, especially if you have its expansions and even more so if you wish to sleeve your cards. These trays were designed with ease of use, printing and with the ability to use the original box in mind.
I didn't go with the single piece insert, to make it easier to print, as well as to allow for use of individual trays while playing.
NOTE: Remember to re-orient each component so that it lays flat on the print surface.
Brims are not 100% necessary, but I've found it much easier to make sure that the prints stick flat to the bed when I had an 8mm brim. And you need the prints to stick to the bed well, as these take a while to print, especially the token tray and card tray. This will also ensure the resulting print is the correct size and shape to fit in the box.
Infill is largely irrelevant as there aren't too many areas that will need it, but I wouldn't go below 10%.
Make sure you use some sandpaper along all the flat edges of each part, to make sure that everything will fit properly in the box.
Keep in mind that the additional tray might need a little more sanding in order to slide smoothly in its place.
Cards: I personally separate the cards in 4 piles for when I'm not saving a game.
1) Locations, Residents, Night Raids, Findings, Exploration, Crime Wave Residents & Night Raids
2) Visitors, Narrative Actions, Colors, Fate, Fittings, Ideas
3) Shelter, Characters, Objectives, Events, blank
4) All Expansion cards
While I'm putting things back in the box after saving a game, I separate the cards in 4 piles once again, by condensing the above to 3 piles, and putting the cards that are currently in use in the 4th pile, and the cards that have been 'removed from the game' in this same pile separated by the blank cards from the ones in use by the current game.
The tokens are placed as shown in the images, but feel free to use each compartment as you see fit. The only one I would recommend to keep as is (using them for the item tokens), are the four large compartments on the token tray.
As far as storing tokens that would be used for a saved game, I would recommend printing a second additional tray, and use it to store any tokens currently in use.
The miniature tray is separated in two compartments. The smaller one is for the expansion miniatures, and the larger one for regular character miniatures, as well as the heart of the city statue.
All booklets can go on top of the token tray. The board and any other larger flat components go on top of everything, and then the box can be closed with no overhang.