They reverse-engineered the motor driver connections – those go through a 74HC245 buffer between the original CPU and the drivers.

Components used to build the DIY Arduino CNC machine project include an Arduino Uno development board, CNC stepper shield running GRBL for control, together with NEMA 17 steppers and motor drivers ...

Arduino or electronic enthusiasts searching for a new project to keep them busy this weekend may be interested in the awesome Arduino controlled CNC foam cutting machine, constructed from a ...