Hi @thorondor nice article! Thanks of for that cool investigation of yours I was a lot of times super close to buy one of those but since the mc1 is announced I will wait on that little bugger ;)

Why are you not using the usb port of the odroid to power the fan ? You can get access to the 5v by using the red and black cable inside the usb cable :) this should easily be enough for the fan. Iam having such a setup with my nanopi M3 which also runs hot like hell without active cooling...