This is a parametric lid built in Fusion that can be parametrically edited to fit any diameter cup, and number of toothbrushes as well as toothbrush diameters.  A couple differences  in the model and in my photo example is that my 3D printed model in the photo doesn't have the 'sleeves' for each toothbrush.  After printing, i realized it would be beneficial to add those sleeves so that 1. the toothbrushes would stand straighter, and 2. water would drip straight down better.  The other change is that I changed the fillets on all edges from .5 to 1mm.  I thought that would be slighter better to guide the tooth brushes as well as help with water drainage.