Question about NutriBullet Nutrient Extractor Combo

It's possible, but not ideal.
You will have to stop every few seconds and push the nuts down to the blades again, so it takes a while and requires a lot of intervention from you.
If nut butters is your primary goal, then you are better off with a food processor than a blender.
With a food processor you should be able to just drop the nuts in and let it go until done.