SCALE UP BY 10X This thing is a formicarium... a fancy name for the nesting enclosure for ants. SCALE UP BY A FACTOR OF 10. The full scale model accepts 18mm diameter test tubes for food and water, as well as moving in queen ants, stuff cotton in the holes not in use. I used a piece of plexiglass to cover the top and poured slab of plaster of paris to absorb water and create humidity, about 35% of the nest is bottomless to allow contact with the plaster and create a humidity gradient in the nest. I am waiting for more workers to hatch before introducing a carpenter ant colony into the full size version. However, I printed a smaller version to house a tetramorium colony, they seem to love it!