Articulated Robot design. His name es Ankly
It is printed articulated, without need of later assembly.
A challenge for your printer, you must adjust... it well to be able to print it since the tolerances for the joints are minimal.
Once printed it is necessary to review and remove the small supports of the piece. http://www.youtube.com/watch?v=dkAjQNrZWSM
You will find two files one at 100% in size and another at 80%.
( 100% size it is easier to get good results)