The Mainboard is a sophisticated control board featuring a high-performance Dual-Core Cortex M4 motion controller. This processing power is what enables the A1 mini to perform its signature Active Flow Rate Compensation and Active Motor Noise Canceling in real-time. The board is responsible for orchestrating the printer's 500 mm/s movements, processing data from the toolhead accelerometers, and managing the 121-point automatic bed leveling.