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any program that you use to make 3d designs are basically a cad program. A lot of people start with sketchup it is free to download from the internet. Just download it and take a shot at it. You can upload to Shapeways after you create a shop for free and never have to spend a dime. You just have to make up your mind to start and begin to learn the system.
Is Shapeways difficult to use or do you need to know CAD?