I currently work as a computer programmer in an engineering lab. As such, I have access to all sorts of CAD software. In addition, the school has various CNC lathes and milling machines that can be used by students for almost no price; all you have to buy is the material. I was thinking I might take advantage and design some simple trumpet parts, like a finger button, or a valve cap. Does anyone have an idea where to start? Maybe a certain program?