If you've been working on a 3D model in MeshLab and want to save it as an OBJ file, here's how you can do it. First, open your 3D model in MeshLab and make sure it's ready for export. Next, go to the 'File' menu and select 'Export Mesh As.' Choose OBJ as the file format and specify the location where you want to save the file. Finally, click 'Save' and your 3D model will be saved as an OBJ file. It's that simple! Whether you're a 3D modeling enthusiast or a professional designer, saving your work as an OBJ file with MeshLab is easy and convenient for sharing and further processing. Give it a try today!