which is based on an earlier Arduino shield, has headers for end stop switches, and the software that runs on the cnc’s ATmega has a firmware switch that can be thrown to enable them, and another to ...

An interesting Arduino project has been published to the Instructables website showing how an Arduino CNC shield and controller has been used to create an awesome 3 axis Arduino CNC plotter.

[Tim] stuck with using the tried-and-tested controller solution consisting of a Raspberry Pi, an Arduino Uno and a grbl shield ... a CNC conversion package, mounting the motors and limit switches ...