Saving your 3D models as OBJ files in ZBrush is an essential skill for 3D artists and designers. Follow these steps to save your work and prepare it for export:

1. Finalize Your 3D Model: Before saving your model as an OBJ file, make sure that it is complete and ready for export. This includes checking for any errors, optimizing the geometry, and ensuring that all the details are in place.

2. Go to the Export Menu: Once your model is ready, go to the Tool palette and select the Export subpalette. This will allow you to export your model as an OBJ file.

3. Set Export Options: In the Export subpalette, you can set the export options for your OBJ file. This includes choosing the file format, specifying the export path, and setting other parameters such as scale and orientation.

4. Click Export: After setting the export options, click the Export button to save your 3D model as an OBJ file. ZBrush will then create the OBJ file with the specified export options.

5. Verify the Exported OBJ: Once the export is completed, navigate to the location where you saved the OBJ file and verify that it was exported correctly. Open the file with a compatible 3D modeling software to ensure that all the details and textures are preserved.

6. Share or Use Your OBJ File: Now that your 3D model is saved as an OBJ file, you can easily share it with others or use it in other 3D projects. The OBJ file format is widely supported by 3D software, making it easy to work with and share your models.

By following these steps, you can save your 3D models as OBJ files in ZBrush and prepare them for export or sharing. This simple process allows you to preserve all the details and textures of your 3D models, making them easy to work with in other software programs or share with other artists and designers.