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With this particular model, Prusaslicer is very optimistic about bridging and support generation:
I don't think this gcode will successfully print.
How do fix adjust the cura setting to generate a printable output?
The model in question is: https://www.delta-fan.com/Download/3D/BUB0612HJ-00.stp
Mockup. Will be a few weeks before the real fan is delivered.
I would put the model in CAD and make it solid using a couple of booleans. FreeCAD can convert a mesh to a solid in the Part workbench.