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Not sure how I feel about all those washers, maybe I'd print some spacers. I think I'll go the lightweight duct route as well. As of now, the petsfang is mounted by just one screw hanging on an angle. Prints fine but there's no space for the endstop, but I think I can make some room for it. Really liking your design by the way. The only thing I'm wondering about is whether the fan orientation has any impact, like a gyroscope.