If you're a 3D artist or designer working with Cinema 4D, you may need to export your 3D models to OBJ format for use in other programs or for sharing with others. Here's a step-by-step guide on how to do it:

1. Select the 3D model you want to export: In your Cinema 4D project, select the 3D model or models that you want to export as OBJ files. Make sure that the model is positioned and scaled as desired.

2. Go to the 'File' menu: In the top menu bar, click on 'File' to open the dropdown menu.

3. Choose 'Export' and then 'Wavefront OBJ': From the 'File' menu, select 'Export' and then choose 'Wavefront OBJ' from the options.

4. Set export options: A dialog box will appear with various export options. You can set the export scale, choose whether to export the model's materials, and select any other desired options. Make sure to review and adjust these settings according to your specific needs.

5. Choose a destination and save the file: After configuring the export options, click 'OK' to choose a destination for the OBJ file and save it to your desired location on your computer.

6. Review the exported OBJ file: Once the export process is complete, navigate to the location where you saved the OBJ file and open it in a compatible 3D modeling or rendering program to confirm that the model has been successfully exported.

By following these simple steps, you can easily export your 3D models as OBJ files in Cinema 4D. Whether you're collaborating with other artists, sharing your work online, or transferring your models to other 3D software, exporting to the OBJ format allows for seamless integration and compatibility with a wide range of platforms and applications.