Noctua 40mm Fanguard, Prusa i3 Extruder
thingiverse
This guard is made to fit every 40mm fan, but it's specifically designed to work perfectly with Noctua 40mm fans. The fins match up exactly with those on the back of the Noctua fan, which is great if you want to install it on the back like I do. There's also a version available that has a cutout to accommodate the Prusa i3 extruder fan without interfering with the z-axis threaded rod. To use this model, you'll need two M3*20mm countersunk screws.
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