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Ultimaker Left Fan Duct Modification
Print part, no special instructions, no support.
Remove old fan shround, remove fan from old shroud.
Add 2 nuts onto your long bolts
Slide on printed part
Attach fan with 2 nuts + 2 long bolts
Optional nut on the bottom.
Make sure it doesn't touch your buildplate when your Y axis is zeroed.
It doesn't on mine, but file if necessary.