Are you in search of a reliable and free STP file viewer to open and view 3D models? Whether you're a designer, engineer, or simply someone who frequently works with CAD files, having access to a good STP file viewer can be a game-changer. Here are the top 5 free STP file viewer tools you should know about:

1. FreeCAD - FreeCAD is a powerful open-source parametric 3D CAD modeler that comes with the ability to open and view STP files. It offers a user-friendly interface and a wide range of features suitable for both beginners and advanced users.

2. eDrawings Viewer - Developed by SolidWorks, eDrawings Viewer is a popular choice for viewing and sharing 3D models in various file formats, including STP. It allows you to rotate, zoom, and measure the 3D models, making it a great tool for collaboration.

3. 3D-Tool Free Viewer - 3D-Tool Free Viewer is a versatile software that supports the viewing of various 3D file formats, including STP. It comes with advanced visualization features and the ability to create 3D PDFs, making it a valuable tool for presenting and sharing 3D models.

4. Fusion 360 - While Fusion 360 is known for its advanced CAD and CAM capabilities, it also offers a free version with the ability to view and mark up various 3D file formats, including STP. Its cloud-based platform allows for easy collaboration and access from anywhere.

5. EnSuite-View - EnSuite-View is a free CAD viewer that supports a wide range of file formats, including STP. It offers features such as model comparison, measurements, and sectioning, making it a useful tool for reviewing and analyzing 3D models.

With these free STP file viewer tools, you can easily access and view 3D models without investing in expensive software. Whether you're looking for basic viewing capabilities or advanced visualization features, these tools have you covered. Try them out and streamline your 3D model viewing experience today!