I used to use empty creamer cups to mix paints, but I use those faster than we can drink coffee, so... here is my quick and easy solution. Depending on your settings, you can print half a dozen at a time in 20 to 30 minutes or so.
The dimensions of the cup as posted are 10mm at the base, 15mm tall, and 15mm at the rim, with a 1.2mm wall. I included a scale model of a typical 2 oz. Plaid Apple Barrel / Folk Art acrylic paint bottle for size comparison... I was fresh out of bananas :)
I didn't use a brim for my prints, but depending on how tight your prints stick to the bed, you may or may not need one for your own prints. Only you know the answer to this question!