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Is there any difference in using the CuraEngine slicer that's already one of the slicers in Repetier Host rather than the standalone Cura software? Can you actually set up the standalone Cura to work with a Rostock Max V2 or is it only used to make the G code?

I really don't know, I've always used CuraEngine and it works fine. Never found the need to install the stand alone program.
If nobody else answers here, you could compare both G-codes and see if there is a difference.