Update 27/12/24: Upon request I added a version for the A1mini which prints in two parts and connects with a dovetail. The original holder fits the Oral-B Vitality Pro which seems to have a narrower base than others. I added a second model which should fit toothbrushes with a width of 3cm at the bottom. 

While renovating our bathroom, we ended up in the situation of not having a working sink for quite some time. We decided to move the toothbrush to the shower because why not?

The bottom of the hanger has drainage holes as well as the typical oral b toothbrush holder that even the charger has. 
The hook itself fits a 10mm thick shower wall.

The holder prints upright with supports for the hook.