3D printing professional, what are the future employment opportunities?

Specific positions are: 3D printer equipment and special processing equipment operation technicians, assembly and adjustment technicians, maintenance and repair technicians, product trainers, 3D modeling technicians, 3D printing products pre-sale and after-sales service technicians, production managers, computer-aided drafters, 3D product drafters, graphic designers, printing engineers, reverse modelers, assembly engineers, model restorers and other positions.