They announced their surprising new open source hardware product, a pocket sized 3-axis CNC machine entirely made ... edge connectors with the (currently Arduino based) controller board.

This familiar footprint manages to contain everything you need for a three-axis machine. The purple boards slotted into the pairs of SIL headers are Pololu Stepper motor drivers. Going this route ...

grbl is stepper motor controller firmware for three-axis cnc machines, intended to run on Arduinos with ... that are too powerful for the normal drivers included on grbl Arduino shields (or integrated ...