My shelves were full of filament in boxes… practical, but not very space efficient. So I measured my shelves, and had to design three different spool rails, because the shelves have different size spaces. Anyhow, all worked out fine as the flat one is flat. Nothing magical there, the other 2 allow for a regular 1kg spool to be stored underneath on the actual shelf ledge so as not to waste space, and the larger one allows for a box or set of small drawers (A bit higher than a regular spool of filament).

I pondered what to use as the shelf connector. I had a couple fo broom handles, so they did. They are 23.6mm in diameter if you want to compare. I also had some 32mm water pipe, and that also worked for a while, but this is the broom handle edition… If you want sets for your particular rod, remix away, or let me know and I'll see if I can custom you up a set.

I'd recommend using rubber feet to stope the shelf sliding around all over. The sides all have flat bits to accomodate.