STL files should be in mm. Make sure in netfabb that when you export to STL you do so in mm. If you don't you can just scale the object in Cura by clicking on it and putting in the correct scale factor. Usually you want to scale by either a factor of 10 100 1000 or 25.4 (25.4 is number of mm in an inch). Except you want it smaller so 1/10, 1/100, 1/1000 or 1/25.4.
if you look at the dimensions in netfabb before slicing the part can you validate that they make sense in mm?
your part might be so big that Cura scaled it down when importing. I believe I've seen that before.
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