If you're working with Maya and need to export your 3D models to be used in other 3D software or for 3D printing, you'll want to save them as OBJ files. Here's a step-by-step guide to help you through the process.

1. Select the model you want to export in Maya. Make sure the model is positioned and scaled as desired, as this will be how it appears in the OBJ file.

2. Once the model is selected, go to 'File' in the main menu and select 'Export Selection'.

3. In the Export Selection window, choose 'OBJexport' from the 'Files of Type' dropdown menu. This will ensure that your model is saved as an OBJ file.

4. Choose the location on your computer where you want to save the OBJ file and give it a name.

5. Click 'Export' to save your model as an OBJ file.

6. In the OBJ export options window, you can adjust settings such as the scale, format, and other export options. Make sure to review these settings to ensure your model is exported exactly as you want it.

7. Once you've adjusted the settings, click 'Export' to save the OBJ file.

Your Maya 3D model has now been exported as an OBJ file and is ready to be used in other 3D software or for 3D printing. Keep in mind that OBJ files do not store animations or rigging information, so this method is best for static 3D models.

By following these steps, you can easily export your Maya models as OBJ files and start using them in other projects right away. Whether you're collaborating with other 3D artists or preparing your models for 3D printing, knowing how to export them in the proper format is essential for a smooth workflow. Happy exporting!