This is modeled after a set of West Elm mid-century modern curtain rods and bracket... I couldn't stomach the 100$ price per window just for the hardware.
In addition to 2x each of the prints, you'll need a 1 inch diameter dowel. These are 4 foot, 1 inch walnut dowels from amazon (20$ each), which I've finished with danish oil and furniture wax. For a natural wood finish I'd avoid pine, but you are after all the Sweeney Todd of your curtain rod. You'll also need 1x M3x8mm socket head screw per bracket.
No supports needed. The bracket cover is a press fit around the bracket itself. If your rod is slightly over 1 inch in diameter make sure to enlarge all pieces proportionally. Strongly recommend making a test print out of cheap filament (but use the same layer height) and then doing a test fit on your dowel.
Pictured prints are in Prusament Galaxy Black with the Prusament .15mm QUALITY slic3r profile.
The author hasn't provided the model origin yet.