This should come in handy. Easy print. Thanks.

lovely thing. The only piece i would change is i wouldn't make left inside corner round, and this way it would stick better to the book.

Thank you for the design and upload! I scaled these in various sizes and printed quite a few of them while adjusting my ironing settings. I used 4x color filament "quantum filament" from Amazon. Prints came out great and work well :)

Glued
Sanded
Spray Painted
Used rebar through the center for extra support.

Any possibility to make model of same box, but half height? The cells are too deep to be handy with small items. (edited)