The NutriBullet doesn't work well as a juicer since the Nutribullet doesn't make the vegetables to a thin enough consistency to turn it into juice like a regular juicer would.
The Nutribullet could be used as a juicer if you add some other ingredients to the vegetables you're juicing to give it a thinner consistency.
I would recommend just buying a regular juicer for making vegetable juice as it would do a much better job and make better juice than the Nutribullet.
The Nutribullet is a great blender though and worth the money if you don't have one.
But you would do best to use an actual Juicer to make vegetable juice.