The OpenScad file is included to make it customizable. Edit to suit your needs. This project creates two different objects - an adapter ring for 1" conduit - a cover plate to cover the knock-out in the bottom of the breaker box. Simply edit the OUTPUT= variable at the top of the scad file to select which version you wish to export. Included are STL files compiled for: - adapter ring (for 1" conduit strain relief) - cover plate (for #4 screw) - All parts (adapter + cover plate) Read the comments in the top of the scad file for full details. Insert the adapter into the bottom knock-out of the breaker box and then install the conduit coupler or threaded strain relief through the adapter. Enjoy!