This STL file is a slight modification of at 18mm copy of owens' customizable Menger sponge model, with the base sliced flat for more reliable printing. It prints well on both the MakerBot Replicator 2 and the Afinia H-Series, with *no* supports thanks to owens' clever built-in support stand. MakerHome, Day 300: http://makerhome.blogspot.com/2014/06/day-300-divisibility-by-100-celebration.html