This is a hexagonal box which I designed to house pieces from my zombie game : http://www.thingiverse.com/thing:229954 : but is an attractive little Thing in its own right. Outside dimensions are 52mm wide by 42mm high, or scale the STL to suit.

Nothing clever here. I created it in DesignSpark in 5 minutes or so and very slightly rounded the top and bottom which I've found makes it easier to slide a wedge under to get it off the plate. This one was printed raftless in PLA onto masking tape at 0.2mm on a Wanhao Duplicator 4.