Compact Planetary Extruder

A Planetary extruder inspired by http://www.thingiverse.com/thing:20884 the base of the extruder is 42 x42 mm and the hight is 68 mm, the gearing is 31+9/ 9 equal 4.444444444444444 it is mounted to a Nema 17 motor.
Update 1: Forgot a file
Update 2: Photos