There’s extensive documentation, GRBL settings, and more pictures in their GitHub repo, too – in case you have a similar CNC and would like to learn about upgrading its controller board!

Update: The Cronos grbl board mentioned below gets analysed in this further EinW blog My small cnc mill project needs motors (so I am told) that are too powerful for the normal drivers included on ...

The machine uses a ‘grbl’ controller, which has an Arduino-based circuit that includes multiple outputs, including a powerful 24V pwm signal that is generally used to drive a 60-80W spindle motor.