http://www.thingiverse.com/thing:1504225 is a recently uploaded eight piece cube dissection puzzle. Here is another dissection of a 6x6x6 cube into eight pieces. It comes from Noam Elkies' answer to a question on mathoverflow. http://mathoverflow.net/questions/53048/cube-cube-cube-cube The eight pieces can form three cubes with edge lengths of 3, 4 and 5 units. Alternately the 8 pieces form a single cube with edge length 6. OpenSCAD code is included.