If you need a toothbrush case when you are traveling, I got just the thing for you. This is toothbrush case that can hold up to two toothbrushes, so would be good for couple trips.
Or if you are alone you can put in some tooth paste and a toothbrush in there for that business trip of yours.
It's pretty simple design that should fit most toothbrushes.

You will need supports for the inner lip of the lid, just use the fill feature in supports painting and click on the inner lip and use grid manual grid supports.
I included picture of the supports settings I used and they were easy to pop off.