This is an extension that installs in Inkscape. It adds lines to an Inkscape document that will result in a living hinge when those lines are cut, usually with a laser cutter. An example of using the living hinge is in the file pencil_box_2side_w_divider.svg 5/26/2015 Version 0.2 has been uploaded. Changed inkex.unittouu to self.unittouu and inkex.uutounit to self.uutounit to make it work with Inkscape 0.91 Thanks to Pete Prodoehl for pointing this out.The full instructions on how to install and use the extension can be found here: http://wiki.lvl1.org/Inkscape_Extension_to_Render_a_Living_Hinge