I've had several people ask, is there a free 3D CAD software. I suggest them to try Autodesk TinkerCAD. TinkeCAD is a free online based CAD application. It runs in your browser. The best browsers are Google Chrome, Safari 13 (or newer) and Microsoft Edge. The operating systems are Windows 10, Apple MacOS High Sierra 10.13.2 or later and Google Chrome OS on Chromebooks. I use Windows 11 and it runs without any issues. The 3D models can be exported in a number of different file formats such as STL, OBJ, GLTF, USDZ (iPad app only), and SVG. These files can be imported into various 3D software for animations and 3D printing.
Try it out and Tinker.