Filament Spool Shelf - Wall Bracket

I designed this brackets to be used in combination with cheap 15 mm diameter metal 'central heating' tubes to make a filament spool shelf. I used one: 15 mm x 1,2 mm x 2m and cut it in half. I costed me less then € 5.Printed with PLA+ it's sturdy enough to hold at least 13 spools no problem as you can see on my pictures.The brackets are also rounded inwards so they won't obstruct any spools right above the backets. You'll need a long screwdriver (or perhaps a very small one) to be able to screw in the top screw. I used a Philips head screwdriver with a 150 mm length, and that was barely enough. Use at your own risk, I'm not responsible for any failures or damage. Mine are still holding strong after 1 year with 13 kg resting on 2 of them.Please post your makes and let me know in the comments what you think!Boost MeMotivate me to make more cool stuff ;)