Hey @BEprints,
I believe @fieldOfView is right, if these settings don't fit your needs, than you have to switch over to CAD.
But it doesn't have to be that difficult.
If the polygon count is low enough you can load your file into Autodesk Tinkercad, remove everything except the blade and load the blade back into Cura as a mesh modifier. It will have the correct shape to be printed as support/infill.
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ahoeben 1,981
You are going to have to remove the inner walls of the blade with a 3d modeler. Cura is not a 3d modeler.
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