Hey there, 3D enthusiasts! If you're in need of a free STL/STP viewer to open and view 3D models, you've come to the right place. Let's explore some of the best options available to help you with your 3D design projects.

First up, we have FreeCAD, a powerful open-source parametric 3D CAD modeler. It supports the STL and STP file formats and is perfect for both beginners and advanced users. With FreeCAD, you can easily view, modify, and analyze 3D models with its intuitive interface.

Next, we have STL Viewer, a lightweight and easy-to-use tool for viewing STL files. This free software allows you to zoom, rotate, and pan 3D models with ease. It's a great choice for quickly inspecting STL files without the need for complex CAD software.

If you're looking for a multi-functional CAD viewer, look no further than eDrawings Viewer. This free tool supports both STL and STP file formats and offers advanced viewing capabilities, including measurement and markup tools. It's a great option for collaborating on 3D designs with colleagues and clients.

Another fantastic option is MeshLab, a powerful open-source system for processing and editing 3D triangular meshes. It supports a wide range of 3D file formats, including STL and STP, and offers advanced mesh processing tools. Whether you're a designer, artist, or researcher, MeshLab has something for everyone.

Last but not least, let's talk about 3D-Tool Free Viewer. This user-friendly software allows you to view and annotate STL and STP files with ease. Its simple interface and powerful tools make it a great choice for anyone working with 3D models.

So there you have it, the best free STL/STP viewers for opening and viewing 3D models. Whether you're a hobbyist, student, or professional, these options have something for everyone. Give them a try and level up your 3D design game today!