I needed to attach 2 Ikea VESKEN Shelf units together to use as spool storage, this allowed me to do so
The VESKEN will hold both boxes and/or spools and two unites will hold 42 spools or boxes
Please Note: going up to the 7 levels was too heavy for the wheels when fully loaded, if you need to move them around freely use this suggestions:
Printing:
Also, you might be interested in a related design. The IKEA VESKEN Wall Rail,Guide & Support