@nallath actually he's talking about the gcode flavor, on the previous versions of Cura it was possible to change it in the machine settings.
He needs to change the GCode flavore from UltiGcode to reprap in order to use it with octoprint
I'm not quite sure what 'reprap mode' is, but you can configure Cura to work with rep-raps. Some people of the comunity have provided us with printer profiles, which will be in the new version (released somewhere next week) or on the github repo https://github.com/Ultimaker/Cura/tree/master/resources/settings
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