They have to want to do it. Having a plasma cutter definitely made people on my old team want to CAD. When they see things they made get cut out from their drawings it does motivate them and get them interested in learning more. Unfortunately not everyone has access to tools like that. A good number for a CAD team would be around 1-4 people. After that it gets hard to keep things organized. Try showing them some finished CAD models from other teams like
these I did for our team this year. I have actually been thinking of teaching my team how to CAD, maybe with a video on how to learn Inventor and CAD a robot in an hour kind of thing. I'd definitely suggest Autodesk Inventor though as I find it way more intuitive and easy to use than Crio.
