Hey there, I am currently a business major college student, so I have limited expereice on robotics. Just to make sure that in order to build the robot, I would need to purchase a Hardware Kit + Aluminum Ki t+ AR2 Robot kit from StepperOnline + CAD models correct? Furthermore, what is the difference between CAD step model and the solidworks model? What would be the case if I have my own 3D printer (Ender 3), what would be the kit that I would not need to necessary purchase? Thanks.