Autodesk’s Tinkercad makes a great classroom tool for 3D modeling. It’s free to use, runs within your web browser (so there’s nothing to install), and is beginner friendly, with easy to understand tutorials and lots of instructional videos. Models are stored on the web site servers, so students can work on their projects at home or wherever, and still easily share them in the classroom. One caveat, students will need to register under their own email address with Autodesk or share a classroom wide registration.
Check out the Gallery section to see what this “simple” 3D modeling software can really do. Highly recommend as a first-step into creating your own designs.