Autodesk’s Tinkercad is one of the most popular classroom tools for creating simple designs from scratch, quickly modifying existing designs. Its a free online 3D design program that you can use in your web browser without downloading any software. Tinkercad is extremely intuitive and easy to use and has built-in Lessons to help you learn the ropes, making it perfect for beginners both young and old.
Getting started with Tinkercad – This pdf offers concrete advice about how to begin using Tinkercad. The manual was written with a K-12 audience in mind, but it can be adapted for use in Higher Education.