The construction line tool by Jim at SketchUp Plugins Blog is a tool that you can add to your tool bar to draw construction lines as you would a regular line. The tool works great and makes it easy to make construction lines quick and fast.
The tool allows you to toggle between having endpoints or not by pressing CTRL just like any other button on SketchUp. But it’s downfall is that it doesn’t allow you to create continuous construction lines (those lines that don’t have ends and goes on forever).
Overall, the construction line tool by Jim at SketchUp Plugins Blog is a great tool and should originally come with SketchUp. At the time of this review the Construction Line Tool is free and is available at sketchuptips.blogspot.com. I give this plugin 4 out of 5 stars!