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Author should check out http://camotics.org/ It's an Opens-Source 3-axis CNC simulator that runs on Mac, Windows and Linux. It not only shows you a visualization of the tool paths but also the resulting cut workpiece.

Disclaimer, I'm the author of CAMotics.

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Author is aware that there are many Gcode simulators.The specificity of this one, thanks to Ada portability, is that the simulator code is 100% the same as the code running in the embedded controller.

No other Open-Source GCode "simulators", as far as I know, simulate the actual cut.

You just made me realize I never looked up the word 'Disclaimer' before. Now that I have, I realize that I've been using it wrong.

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