If you're looking to share your 3D models created in Cinema 4D with others or want to use them in other 3D software, exporting them to OBJ format can be a convenient solution. Here's how you can do it:

1. Open your 3D model in Cinema 4D and make sure it's ready for export. Ensure that all the textures and materials are applied correctly and that the model is positioned and scaled as intended.

2. Once your model is ready, go to the 'File' menu and select 'Export'. Choose 'Wavefront OBJ' from the list of file formats.

3. In the export settings, you can specify the desired options such as whether to export materials, textures, or groups. You can also select the scale and other specific settings for the OBJ file.

4. Choose a location on your computer to save the OBJ file, give it a name, and click 'Save'. Your 3D model will be exported to OBJ format, along with any specified settings.

5. Now that your 3D model is exported to OBJ, you can easily share it with others or import it into other 3D software for further editing or rendering.

Keep in mind that while OBJ is a widely supported file format, it may not preserve all the advanced features and functionalities of your original Cinema 4D model. For example, complex animations, dynamics, or advanced material properties may not be fully preserved when exporting to OBJ.

In conclusion, exporting 3D models from Cinema 4D to OBJ format is a straightforward process that allows you to share your creations with others or use them in different 3D software. Just remember to ensure that your model is properly prepared for export and be aware of any limitations or potential loss of detail when going from Cinema 4D to OBJ.