There are several non-original fans for the blower part, for e3. my e3 has a small lip that has tiny screws attached to it to attach it to the fan case. These fans have it, but others I've bought fit e3 but NOT the bullseye (Thingiverse). I have to return the rest. I keep this! Haven't tried installing them yet but visually they are the right shape to match the bullseye canal. I'm glad I found and tried them. Now I have to return others that don't fit this aftermarket fan.
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