Lack Spool holder

I was tired of storing my spools in boxes.
since i made the Lack printer enclosure i wanted to incorporate my spools in the same enclosure.
as you can see in the image you can store 7 standard 1kg spools next to each other, and 2 above each other.

this design was created to hold the Ikea Hjalpa clothesrail:
https://www.ikea.com/nl/nl/catalog/products/50331205/
the rod has a 25mm diameter and has to be cut to length to fit between the side panels.

i have used hardboard to test with, eve