If you're using SketchUp Free for your 3D modeling projects, you may need to save your designs in a format that can be used in other software programs. OBJ files are a popular choice for 3D models because they can be easily imported into a variety of programs. Here's how you can save your SketchUp Free designs as OBJ files.

1. Open your SketchUp Free project and make sure it is complete and ready for export.

2. Click on 'File' in the top menu and select 'Export' from the drop-down menu.

3. Choose '3D Model' as the export type.

4. In the 'Save As' dialog, select 'OBJ' as the file format.

5. You can also adjust the options for the OBJ export, such as including or excluding materials and textures.

6. Click 'Export' to save your SketchUp Free design as an OBJ file.

Once the export is complete, you can use your OBJ file in other 3D modeling programs or share it with others who use different software. Keep in mind that the OBJ format may not support all the features and details of your original SketchUp Free design, so it's always a good idea to check the exported file in the software you plan to use it in.

Saving your SketchUp Free designs as OBJ files opens up new possibilities for collaboration and sharing your work with others. Whether you're working on personal projects or collaborating with a team, having the ability to export your designs in a widely-compatible format can make your workflow much smoother.

Remember to always respect intellectual property rights and only use or share 3D models that you have the appropriate permission for. Additionally, make sure to familiarize yourself with the specific requirements and limitations of the software you plan to import your OBJ files into.

By following these steps, you can take your SketchUp Free designs and make them accessible to a wider audience by saving them as OBJ files. This simple process can help you integrate your work into a variety of 3D modeling pipelines and expand the reach of your creative projects.