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When combined with its mirror (set B), this forms a sliding puzzle in which the 8 pieces assemble into a cube.
This is the version with sprues connecting the pieces which you will need to cut with a thin hacksaw or knife to separate them.
Apart from these sprues this model is identical to "Cube Slider (no sprues) set A".
The version with sprues is cheaper because Shapeways charge a larger handling fee for models consisting of multiple disjoint parts.
I have not added any mark-up on this model. The mesh files are available for download.