Hehe I never saw anyone put a garbage bag over 3D printer but if it helps why not

Well slic3r has option to print skirt more than one layer thick. It slows down printing a bit and uses more filament though. It will prevent direct exposure to any excess airflow from the fan and also trap some heat.

I agree Cura is awesome but I got sort of used to slic3r + pronterface combination and it's pretty hard to kick the habit of using those

- Filip