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Thanks very much for creating this fan design. It's working great and much more robust that the original.

I found it best to rotate it to print laying flat on the bed rather than upright. There should then only be supports for the three screw mounting flanges.

Of the three fan original mounting screws only one of them was long enough which is the one that held the original fan duct on. The other two screws were about 2mm shorter so just be aware that you will need two more M3x18 machine screws.