Hello, I am a 3D modeler that is currently looking to get into CAD. I have a few questions before hand... 1. What is needed/Required to get a 3D model ready for printing? 2. How big can a model be? In both inches and centimeters 3. I am looking to prototype a miniature line here on shape ways. Would anyone have ANY suggestions on doing that. My current 3D program is Blender 3D - does anyone have any suggestions for a easy to use Cad program that is cheap?