Sapphire Plus spool holder

This is a custom spool holder for Sapphire Plus.

I don't like my filament spool hanging on the side or on the top, so I created this holder to be mounted in the back. Later, when I enclose my printer, spool will be inside. There is not enough space for it to sit flush with the back side, about 4 cm sticks outside. Using this many screws is probably an overkill, but I like it this way.
It is adjustable for different width of spools, mine are 7 x 20 cm.
I had two off-cuts of chromed steel tube used for hanging clothes in wardrobe, about 190 mm long. Just enough to use for this project. And I like the looks of chrome with black.

BOM:
18x M4x8 screws
14x M4 nuts
4x M4 T-nuts
4x 608 zz bearings
370 mm rounded steel tube 15x30 mm
About 230 grams of filament