Easel files run unmodified on Marlin. The g-code that Easel outputs is generic and uses only a few g-code commands. There is a bit more information in my post here. The only issue is that it is that Easel does not generate a pause and prompt to turn the router on, so you either have to turn it on before you run the g-code file, or somehow add that code to the top of the g-code file. Many g-code sending solutions like Repetier-Host allow you to automatically put lines of g-code at the top of the file when it is sent.
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