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Marlin
Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
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I got a new skr mini v3 and flashed with marlin. The main board cooling fan turns on, but the part cooling and hot end fans do not turn on. I've checked that the fans still work and they do by swapping them to the main board fan port and they turn on. I can only turn on the hot end fan by manually turning it on in octoprint. I believe it's a firmware problem but I don't really know where to check for that in the firmware. I've looked at other posts on this subreddit but they haven't helped.