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I dont mind the crunchy of nut butter but i have a very cheap blender that is lasting us for 4 years so far but it can't blend for very long after 3min it overheats...

Then it may be better not to make peanut butter, you don't want to set the whole blender on fire! But 4 years for a very cheap blender is quite good, I must admit. :)

Yes it surely is:) and i use it fairly often so he is doing very well:D