Organizer for the super cute board game Flame Craft. I got a copy with all the kickstarter extras except for the organizer so 3d printing to the rescue.
Included are spacers to make it a tight fit into the box as well as a second large cart organizer and small tray set that have a lip on the bottom to lock it in place.
Why so many trays? Every time I play I found that I needed resources on both ends of the board so 12 trays instead of 6. Also note the orientation of the trays, they only fit one way ( its not a perfectly square space.
The author marked this model as their own original creation.