When I bought the Oxo Baby Bottle Brush, I found the little stand it came with (shown in photo in white) very convenient, but could find nothing similar for the full-size Oxo bottle brush. So I made one. I've included the parametric Freecad file, which is set up to easily be adjustable for your required dimensions - just edit the named constraints on the single sketch, you don't even have to click into the sketch.
Design is primarily constrained by the total height, the radius of the base, and the radius of the opening for the brush handle, but additional parameters include the radius of the drain hole in the bottom, the width of “lip” at the top, and the thickness of the base.
The author marked this model as their own original creation.