SketchUp is a powerful tool for creating 3D models, and once you've finished your design, you'll likely want to share it with others. One of the best ways to do this is by saving your SketchUp file to be viewed in 3D. Here's how you can do that.

1. Save your SketchUp file: Once you have completed your design in SketchUp, the first step is to save your file. Go to 'File' > 'Save As' and choose a location on your computer where you want to save the file.

2. Export as a 3D model: To enable viewing in 3D, you'll need to export your SketchUp file as a 3D model. Go to 'File' > 'Export' and select the file type as '3D Model'. You can choose from formats such as .obj, .dae, or .fbx, depending on your preference and the platform you intend to use for viewing.

3. Choose your settings: When exporting your file, you may have the option to choose different settings for the 3D model. These settings can affect the quality and size of the 3D model, so be sure to select the options that best suit your needs.

4. Share or view your 3D model: Once you have successfully saved your SketchUp file as a 3D model, you can now share it with others or view it yourself in a 3D viewer. There are various platforms and applications that support 3D model viewing, so you can choose the one that works best for you or your intended audience.

By following these steps, you can save your SketchUp file to be viewed in 3D and easily share your designs with others. Whether you're showcasing your work to clients, collaborating with colleagues, or simply admiring your creation from different angles, viewing your SketchUp model in 3D can bring your designs to life.