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Type: CNC firmware
Platform: Atmega328
License: GPLv3
Source: Grbl project
Input Formats: G-code
Output Formats: signals for CNC movement
Users: Mitja

Grbl is a firmware for Atmega328 (the microcontroller on most Arduino boards).

You can send G-code to it via USB serial connection to control a CNC machine or the machine's stepper motor drivers.

The Marlin firmware on many 3D printers is derived from Grbl.