For further experiments, I'm trying to compile the firmware within the Arduino IDE.

I went to GitHub and grabbed the RepRapFirmware files. I renamed the folder into RepRapFirmware. I also downloaded Arduino-libraries from GitHub and added those files to the RepRapFirmware folder. Trying to compile in Arduino IDE, I'm still getting "fatal error: utility/compiler.h: No such file", even if the file is there?

Can anyone help, please?

You can't build the firmware in Arduino IDE, you have to use Eclipse. See this thread [forums.reprap.org].

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].