What Does Marlin Firmware Do?

What Does Marlin Firmware Do? Marlin Firmware runs on the 3D printer’s main board, managing all the real-time activities of the machine. It coordinates the heaters, steppers, sensors, lights, LCD display, buttons, and everything else involved in the 3D printing process. What is Marlin firmware 3D printer? Marlin is an optimized firmware for RepRap 3D