Leave Room for Expansion
Great Stuff works well for filling in cracks because after you fill the gaps, it continues to expand.
Pull the bottom "lid" out of the way and fill 'er up. You won't want to fill it all the way to the top or as it sets up, it will flow over the top and make a mess.
Epoxy foam is messy if you get it on your hands, so you if you have some latex gloves, wear them.
Let the foam dry for a couple of hours. You'll be able to tell that the foam is completely dry when you cut into the middle of the foam with a knife and it comes out clean. If it comes out gooey, let it dry some more.
With a sharp knife, carve away the excess foam so the bottom lid can close all the way.
Glue down the bottom lid and you're good to go. If you print up a half dozen of these paper miniatures, you're ready to terrorize your Roleplaying victims on the cheap.
Come back to www.how-to-paint-miniatures.com from time to time. I'll make paper miniatures out of many of my miniatures for your enjoyment.