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Using current version of MC, I don't see an option for creating a raft when configured to use CuraSlicer.
It is available using matterslicer.
I can create a brim using loops but a raft could be useful for some of my prints.
Was making a raft ever present with cura as a sliced in MatterControl?

Probably will need to run cura by itself to get anything special to work.

Many of the settings in MatterControl are only available using their slicer.