Just as a defining shape. All this may be a matter of safety, because the material used may not be entirely secure, and 3D graphic & printing process might cause cancer.
Just as shaping up only. This may be a matter of safety. The material may not be totally safe. And verification processes in a 3D film can cause cancer.
Just as the shape up. This may be a matter of safety. Due to the materials used may not be safe. And the process of printing factory 3D may cause cancer.