Filament spool holder, ceiling.

I did not find exactly a filament holder which fit my needs for a; table bottom mounted spool holder. I designed this part so it doesn't need supports or anything else, and should be a print in place part.

It does have a little bit of sag but it should be strong enough to hold anything under 1.5kg without any problems.

The following spools will fit:
Width: 80 mm or smaller
Diameter: 270mm or smaller