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So I finally got around to building the 40mm version, and there is just too much weight. About 90% throttle is required to hover. I was wondering could the link points be shrunk? I know the inside wall needs to stay where it is for the FC mounting holes, but the outside wall could be brought in and everything thinned out (don't need such a large link since its so small/light). The link points could also be shrunk on top and bottom (doesn't need to scale the whole duct). The FC mounting holes would move up if the link is moved up, but that is fine since there is plenty of room inside already (I am using long nylon screws to get my FC just above to top for USB access). I think these modifications and 0% infill could bring the weight down quite a bit.