Thank you @ranOOm and @technik3k! Yes please send me the CAD files. Let me explain why I want them…
Below are some pictures of sample lifts that we keep around the lab. Made from Vex IQ parts, we have about ten different types of lift models. You can physically move the lifts up and down to see how they work. We have similar models for gear ratios. These are effective, the kids like looking at them and get kind of hypnotized watching them move. But they take up space, break easily, and are not always handy when you want them.
For differentials, what I would like to try instead is having CAD models that would allow someone to control the movement of the model. As with the lifts, you can try and explain how these things work, but letting kids watch the movement while controlling it is what really makes the concepts sink in.
