MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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Sure! I started using i with a Ramps. You will need external 5V supply as the Arduino regulator can not handle the current of the servo. I already had one UBEC used to supply the raspberry pi at the time and used that source. You can feed the servo directly from it (check your wiring) or you can look on how to supply the Ramps with an external 5v source.
About the firmware I used Marlin at the time but look for instructions on how to use any servo/switch based probe with Repetier and the setup should follow the same instructions.