Assembled chain

This is a pre-assembled chain written in OpenSCAD, the hinge thing is stolen from http://www.thingiverse.com/thing:140343 by http://www.thingiverse.com/someandy, which works really great. You can change the variables num_links_per_row and num_rows in the scad-file, the given stl file is the one in the picture, where num_links_per_row = num_rows = 3. The script always creates num_rows-1 number of vertical help links.