I purchased a set of double curtain rods, and the cheap metal bracket bent almost immediately. After a few iterations in fusion 360, here's a strong replacement! Features a clamp, as well as through-holes for ease of installation. Holes should be large enough to accommodate a typical bit holder (I have a DeWalt bit holder).
Rod diameters are 16mm/22mm (6.5"/8.5"). If yours are a little larger or smaller there should be a little wiggle room.
Requires a M6x20mm bolt & nut per bracket.
Recommend printing with 3-4 perimeters and at least 40% infill. No supports needed.
Tested for two years with HTPLA, and still going strong! If you live someplace warm, I wouldn't recommend regular PLA.
The author marked this model as their own original creation.