Esun Ebox shelf

I wanted a shelf for my Esun Ebox to mount to my printer using the factory filament spool holder arm. Designed this for just that, and designed to use the nut from this spool holder (https://www.thingiverse.com/thing:3209211) as I already had one printed, I've included the file for the nut. Print standing up, attach the 2 parts together with an M4 bolt and nut. It's not pretty but it works