Controller 2020-01-25 HP Persson Leave a comment The controller is the brain of your laser machine, it controls the stepper motors driving the movement of your machine. There is different controllers out there. The most common controller for the K40 is the M2 Nano shown below. Go Back to previous article | Back to Wiki index ADVERTISMENT Time for a new set of optics for your laser machine? Lens & mirror kits starting at €49 Quick delivery in EU with stock in Sweden! Check out our spare & upgrade part store here!