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When you say that it shows perfectly in cura, do you mean Normal View mode or also Layers View mode?(These were in cura 15.02.1 and that was the last time I used it, so I don't know how it is in the new one) You can also visualise your gcode in Repetier-host or on some online gcode viewer. If hair is not present in gcode, check settings: nozzle size, extrusion width, thin wall settings, bridge settings.
If the hair is present in gcode, then check bridge settings, such as bridging flow ratio,...