Double Biobox mini body

This is the exact same great filter cartridge replacement for the aquatlantis biobox filter as the very good original design.

Because most aquarium filters don't use active carbon and the plastic layers between each box end up using valuable media space, 2 can be printed to house mechanical filtration layers and the second dedicated to biological, with some easy to change out filter floss on top of the stack.

this remix is slightly shorter than two original boxes stacked because it was made simply by cutting off the top on one and the bottom on the second, and joining them together.