Guida in Italiano: http://forums.reprap.org/read.php?352,416597
There are two options for this feature. You may choose to use a servo mounted on the X carriage or you may use a sled that mounts on the X axis and can be docked when not in use.
See the section for each option below for specifics about installation and configuration. Also included are instructions that apply to both options.
3. Some boards require special files and/or libraries from the ArduinoAddons directory. Take a look at the dedicated [README](/ArduinoAddons/README.md) for details.
3. Some boards require special files and/or libraries from the ArduinoAddons directory.
4. Start the arduino IDE.
5. Select Tools -> Board -> Arduino Mega 2560 or your microcontroller
6. Select the correct serial port in Tools ->Serial Port
7. Open MarlinKimbra.pde or .ino
7. Open MarlinKimbra.ino
8. Click the Verify/Compile button
9. Click the Upload button. If all goes well the firmware is uploading
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9. Click the Upload button. If all goes well the firmware is uploading