Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2121914.

I have made other makeup / nail file holders before:

Unicorn one: http://www.thingiverse.com/thing:2065359

Nail file / makeup brush: http://www.thingiverse.com/thing:1760758

but my wife needed one that held more brushes. I took my nail file one that just stretched it out to 125 mm long by 70 mm wide by 75 mm tall. It is the same height as my nail file one.

As you can see the opening is just one big opening, not divided in any way but it holds a ton of different brushes. It allows you to move your brushes around and with the base being flared out it is really stable.