This is a dice designed for the FATE RPG system. Instead of the normal cube with 2x each of ( + , - ,blank) this dice has 4x of each ( + , - ,blank).
For the cube version, see http://www.thingiverse.com/thing:870957

As always, use an X-acto knife, razor blade or a dremel to take off the 'first layer squish' on the bottom of the part where the heat from the bed has melted the plastic slightly (and often printers have a built-in setting that makes the first layer 200% thick). When the bottom layer is slightly wider than the upper layers, it makes the dice not roll as evenly.