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Aluminum Heat Sink for Raspberry Pi 3 or 4 - 15 x 15 x 15mm : ID 3082 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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The Great Raspberry Pi Cooling Bake-Off: Comparing Passive Heatsinks and Active Cooling for the Raspberry Pi 4|downey.io
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RaspberryPi – Ice Tower: The best cooler for your device! From 70C to <40C in a 60 minutes process running at 100% in all 4 cores – El Bruno
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