Stuffed Fables Box Insert / Organizer

This is a rework from ground basedon xgrubers "Stuffed Fables Box Organizer".

There is really nothing new, just some changes:

- splitted figure trays for better printing with smaller printers

- consistent wall thickness for better printing:
o either 3*0.4 mm = 1.2 mm
o or 4*0.4 mm = 1.6 mm

- slightly optimized space usage
- slightly lower floor thickness
- works with sleeved cards

Everything else is nearly the same.


Hints regarding printing thin walls:
Printi