Ink jets and laser printers need 2D motion control. Who sells ink jet or laser printers ? robot companies, motor control companies, or motion control companies ?
Do you really believe control is the most important thing of robot controllers ? I am familiar with classical and“fancy” control theories and I have a long list of control projects in which I have been involved. If you have an universal controllers that work well on every control application, please let me know. I often day-dream of such a controller.
You can religiously believe motion control is the flesh and blood of the 3D printers, if you want. I read a very entertaining post, saying a medical robot company has a core technology needed for 3D printers. Of course, that person is a stock holder of the medical company.