The ALCH system for storing things in Ikea Alex drawers works well for most sets but he did not do support for the tall 9 drawer system. It's a little bit shallower than the smaller unit.
This box fits between the normal other boxes. It does not fit the 40mm grid of the origional so I have not included the base in it.
It's quite long and as I'm not quite as skilled with the CAD to create the filament locks that the assortment system comes with I have just given the full model and you can cut it in half in the slicer and glue it together.
I've included the openscad file. You can use the param at the top for change for the deep drawer or just use the .3mf files.
The author remixed this model.
I've just copied some of the dimensions but this is only really useful with the ALCH versions.