If you're a Mac user and work with 3D models in STL format, you'll need a reliable STL file viewer to open, view, and edit your designs. Fortunately, there are several excellent options available for Mac users that offer powerful features for 3D modeling and printing. Here are some of the best STL file viewers for Mac: 1. **FreeCAD**: FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects. It offers a modular architecture, allowing users to install additional workbenches, and it's perfect for anyone who wants to get started with 3D modeling. 2. **MeshLab**: MeshLab is an open-source, portable, and extensible system for the processing and editing of unstructured 3D triangular meshes. It offers a wide range of features, including rendering, texturing, and converting 3D models, making it a versatile choice for Mac users. 3. **Blender**: Blender is a free and open-source 3D creation suite that supports 3D modeling, rigging, animation, simulation, rendering, compositing, and motion tracking, as well as video editing and game creation. It's a powerful tool for professional 3D artists and hobbyists alike. 4. **SketchUp**: SketchUp is a 3D modeling computer program for a wide range of drawing applications such as architectural, interior design, landscape architecture, civil and mechanical engineering, film and video game design. It's user-friendly and perfect for beginners in 3D modeling. 5. **Fusion 360**: Fusion 360 is a cloud-based computer-aided design (CAD), computer-aided manufacturing (CAM), and computer-aided engineering (CAE) software platform. It connects your entire product development process in a single cloud-based platform that works on both Mac and PC. These are just a few of the top STL file viewers for Mac, and each offers unique features and capabilities for 3D modeling and printing. Whether you're a professional designer or a hobbyist, there's a perfect STL file viewer for you on Mac. Check out these options and find the one that best suits your needs and workflow for 3D modeling and printing.