Are you in need of a reliable and free STP file viewer to examine 3D CAD designs? Look no further, as we have compiled a list of the top 5 free STP file viewers that will help you analyze, inspect, and visualize your STP files with ease. Whether you're a professional engineer, a designer, or a hobbyist, these tools are perfect for viewing your 3D designs without having to spend a dime. Let's dive in and explore the best options available for viewing STP files for free. 1. FreeCAD: FreeCAD is an open-source parametric 3D CAD modeler that provides a built-in STP file viewer. It offers a wide range of features for designing and analyzing 3D models and is suitable for both beginners and experienced users. 2. Autodesk Viewer: Autodesk Viewer is a free online tool that allows you to upload and view 2D and 3D CAD files, including STP files, without the need for software installation. It supports various file formats and provides essential collaboration and markup features. 3. A360 Viewer: A360 Viewer is a web-based viewer by Autodesk that enables you to view 2D and 3D CAD designs, including STP files, from any device. It offers powerful visualization and sharing capabilities, making it a great choice for collaborative projects. 4. eDrawings Viewer: eDrawings Viewer is a free software from Solidworks that allows you to view and share 2D and 3D designs in multiple file formats, including STP. It features easy-to-use tools for measuring, markup, and cross-sectioning, making it an excellent choice for design review. 5. 3D-Tool Free Viewer: 3D-Tool Free Viewer is a standalone application that supports viewing and analyzing 3D CAD models, including STP files. It offers various visualization and analysis tools, such as measurement, sectioning, and exploded views, for effective design evaluation. With these free STP file viewers, you can easily explore and analyze your 3D CAD designs without investing in expensive software. Whether you're reviewing a colleague's design, presenting a project to a client, or simply studying a 3D model, these tools offer a convenient and cost-effective solution for viewing STP files.