Filament storage stack Bambu boxes stackable trays

Thanks for reading carefully to make sure you understand the design intention with this 3D model. There are plenty of 3D files on the web for stackable shelves, but I wanted to have a tight tray to maximize my desk space and to use less plastic to print the trays, so I came up with this 3D model. My design is done according to the following principles :limit filament usage (only 85g per basket shelf) ;have narrow walls (to avoid wasting “width” space and plastic) ;snug fit the boxes in the trays (again to avoid wasting space);have shallow shelves, to use less plastic and only where it's useful. Also simplifies pulling out of the boxes ;be stackable (of course !) ;should accommodate all types of Bambu boxes (2 old types + 2 new type of boxes) (fits Ele-goo and Overture as a bonus!)must also fit an unboxed Bambu spool. The "vertical walls" of the trays must stack in each other (the last tray must have the end cover). The tray walls are solid by the interlocking action of the