Spool storage for Innofil3D 750g spools

Reusing Innofil3D 750g spools.
8xM4 x 20mm bolts (per spool) with 3.5 mm holes drilled in the spool will hold the boxes in place.
Reusing 608zz bearings from my old in-line blades.
1x M8x40mm bolt,
2x M8 nut (you can also print it)
here is how to assemble it:
https://manuals.velleman.eu/article.php?id=765
(I drilled a hole in my shelf to fix the M8 bolt)
then put the assembled spools on it.