My Father complained that the sonicare falls over way too easy even when it is on the charger.

Here is my solution to the problem. It's very stable and fits the charger too.
You can pretty much throw the toothbrush in and it'll charge and wo'nt fall over very easy.

Creality

Ender 3

Yes

0.2

25%

Be a litte careful with the support in the slicer, you have to put a support blocker for the water channel