HDX Wire Rack Hanging Spool Holder

Hi all, Recently printed the Smoothy and wanted a cleaner way to hang an external spool on my Home Depot wire rack. Couldn't find something that fit quite right, so I designed my own. Spacing between wire rungs is 20mm, hardware is M4 screws/nuts. Nuts should press fit. Link to wire rack: https://www.homedepot.com/p/HDX-6-Tier-Commercial-Grade-Heavy-Duty-Steel-Wire-Shelving-Unit-in-Chrome-48-in-W-x-72-in-H-x-18-in-D-HD18481302PS-1/203846551