If you work with 3D CAD files, you may have come across the STP file format. STP, which stands for Standard for the Exchange of Product Data, is a widely used file format for 3D models and CAD drawings. To view and interact with STP files, you'll need a dedicated STP reader or viewer. Luckily, there are plenty of free options available. Here are our top 5 picks for the best free STP readers to use in 2022:

1. FreeCAD: FreeCAD is an open-source parametric 3D CAD modeler. It supports the STP file format and offers powerful features for viewing and editing 3D models.

2. eDrawings Viewer: eDrawings Viewer is a free software from SolidWorks that allows you to view and review 3D models and 2D drawings in the STP file format. It also supports markups and annotations.

3. Autodesk Viewer: Autodesk Viewer is a web-based tool that lets you view and share 2D and 3D designs in the STP file format. It's free to use and doesn't require any software installation.

4. Fusion 360: Fusion 360 is a cloud-based 3D CAD/CAM tool that offers a free subscription for personal use. It supports the STP file format and provides a range of features for viewing and collaborating on 3D models.

5. OnShape: OnShape is a free cloud-based 3D CAD platform that includes built-in support for the STP file format. It's ideal for viewing, editing, and collaborating on 3D designs without the need for any installations.

With these free STP readers, you can easily view, analyze, and share your 3D CAD files without investing in expensive software. Whether you're a professional engineer or a hobbyist maker, these tools provide convenient access to the world of 3D design and modeling. Try them out and see which one works best for your needs!