What is GRBL?
GRBL is a free, open-source firmware used to control the motion of machines. It's limited to Arduino-based controllers.
Easel currently supports the following GRBL versions: Grbl 1.1h, Grbl 1.1g, Grbl 1.1f, Grbl 1.1e, Grbl 1.0c, Grbl 1.0b, Grbl 0.9j, Grbl 0.9i, Grbl 0.9g, Grbl 0.8c
How do I find out if my machine has GRBL?
If it's Arduino-based, chances are it's running on GRBL. You may need to reach out to your machine provider and ask for the firmware version.