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Aluminum Metal Heatsink Raspberry Pi 4 Case [Without Fans] : ID 4341 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Geekworm Aluminum Alloy Embedded Heatsink / Cooler / Radiator Support 30x30mm Fan (C235) for Raspberry Pi Compute Module 4 - AliExpress
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How to Install Heatsinks on the Raspberry Pi 4 (CanaKit) + Temperature Performance Comparison - YouTube
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