a layer of 3 cubes by 3 cubes that are hollow and have cut out sides three high with a layer of 2 cubes by 2 cubes that are also hollow stacked 2 hihg interlocking all the other layers creating a fun to play with mess of cubes in a bigger cube. bit hard to describe well.

i do not take credit for this design i replicated it in cad after seeing it on shapeways website they have a lot of awesome stuff on there i suggest checking it out.

print with supports that are easy to remove and make sure that you have some tweezers and time when you do this it took me i think 4 hours on and off to remove all the supports from this thing but it was well worth it i didnt put it down for the rest of the day just playing with it because its just one of those things that your fingers like to play with.