Saving your Photoshop file as an OBJ format is a great way to export your 3D model for further use in other programs or for 3D printing. Here's how to do it:

1. Open your 3D model in Photoshop by going to File > Open and selecting your file.

2. Once your model is open, go to File > Export > Export 3D Layer.

3. In the Export 3D Layer dialog box, select OBJ as the file format and choose a location to save the file.

4. Click 'OK' to save your file as an OBJ format.

That's it! You have now successfully saved your Photoshop file as an OBJ format. You can now use this file for 3D modeling, printing, or importing into other 3D programs. Saving your file in OBJ format allows for greater versatility and compatibility when working with 3D models. Try it out yourself and see the difference it can make in your 3D design workflow.