The toothbrushes were still lying around the bathroom, so I decided to do something about it. You can stick it with double sided tape or glue to the cabinet or loose on any surface, or in the shower.
The model does not require any supports.
Square holes in the bottom are for water drainage, etc. if you plan to use it in the shower.
Inspired by Bobik189 holder:
https://www.printables.com/model/153596-wall-toothbrush-holder
The author marked this model as their own original creation.