This is a dice tray designed with storage and portability in mind. It has no external customizations, but they can be easily added in your 3d modelling application of choice.
Lid slides off and has a door inside that is removable, which reveals 12 little containers for keeping dice or gaming supplies separate and organized.
EDIT: Updated door to have some tolerance around the sides. Also added a filet to the edges of the door to facilitate better removal from build plate and insertion into the tray lid.