Ultimaker 2 extruder fan mod

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I designed a small spacer for the extruder fan that reduces turbulence noise and increases airflow over the heat sink, allowing for better cooling. To reuse the 2 screws removed from the fan, I included them in the design. This modification simplifies air circulation around the heat sink, which should lead to improved performance with single or dual extruders. For UM2 users, I've added an enhanced version of this mod, featuring a more robust structure.