About this 3D model
Here is the 4th version of GoPro fixation with Ball joint. The 1st one is here: http://www.thingiverse.com/thing:38040 The 2nd is here: http://www.thingiverse.com/thing:38042 and the 3rd is here: http://www.thingiverse.com/thing:38397 It is made with 6 parts