I design this toothbrush holder with Fusion 360. The toothbrush hole is 17mm so it should fit most standard toothbrush. Printing will need some support, please check the 3D printing settings.
Flip the model to the side so it doesn't need support. I printed with Sovol SV01, temperature set at 205/50, 20% infill. The toothbrush holes may need support depend on printer, I suggest add it to be safe. The water drainage at the bottom definitely need support. I will update to have better angle so we don't need support next revision.