Great fanless solution. I am using an old Raspberry Pi 3b for network security (DNS PI-HOLE well) and 3b+ as a low power backup computer. Both SBCs are well protected. They don't experience much stress other than a few eruptions here and there, so I never see temperatures above 40 degrees Celsius. If you have a similar use on Raspberry Pi 3 3b or 3b+ I recommend Armored Cases. Everything works cool and silent.
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