Simple Wall Mount Spool Holder

I tried to design this wall mount avoiding the use of support, with less screw as possibile and trying to keep it simple. The mount have a shoulder and a bigger end to keep the spool in place and avoiding scar on the wall. The end of the arm have a diameter of 45mm (actually, a little less due to the flat base) so should fit every spool (if you need something smaller, let me know in the comment)

To use as less plastic as possibile, I've uploaded various size of the spool holder, from 70mm to