In this chapter, you installed SketchUp and customized a template that will allow you to model for 3D printing quickly. You learned what extensions are, how to install them, and where to find many more that are not available in the official Extensions Warehouse.

You made your first 3D-printable STL file, and imported the file back into SketchUp. Finally, you also learned why it's important to merge coplanar faces on imported STL files. In the next chapter, we'll learn how to design a 3D-printable model starting from a 2D sketch.