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Infill variable density?

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I am making a part that needs strength on the bottom part but not as much on the top.  It is a knob.  The part that connects to the equipment (the neck) needs to be stiff so it doesn't break or twist.  The top part that you use your hand to twist does not (I don't think) need to be as strong.  Is there a way to vary the infill density from the bottom to the top?


I could make 100% but I am trying to save time and material.



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