How to configure ESTLCam to work with GRBL

In order to configure EstlCAM and make it produce GRBL optimized GCode you have to follow the following 2 steps

Step 1 - Open Basic Settings

From the top menu click on Setup-->Basic Settings

Step 2 - Choose GRBL

From the right list choose the GRBL option and click the OK button. 
You can also choose the units you want to use for feeds and speeds