I thank you for your reply.
The "desired_image" is the the desired product that I would like to generate. The problem is that when I enter the STL image into CUT3D, the end mill removes material from areas that I want untouched. Please see the image "Normal_mode_problems".
If you have CUT3D will you, please, tell me how to do generate the "desired_image" from the attached STL image? I am not the most proficient user of CAD programs. If this is not possible, then please tell me so.