In the beginning I was for buying Netfabb too, just to be guided and helped during the printing processes, but now I can really say that Cura is a great software and you don't really need anything else.
I suggest you to get practice with it using the layer visualization option and the automated tools for print supports.
Good luck,
Marco.
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IRobertI 521
Netfabb no longer actively supports Ultimaker printers. I would not advice you to try and purchase it.
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