Air duct cleaning robot.
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Previously:
https://www.homemadetools.net/forum/...886#post175498
https://www.homemadetools.net/forum/...539#post177998
https://www.homemadetools.net/forum/...068#post164793
https://www.homemadetools.net/forum/...168#post161153
https://www.homemadetools.net/forum/...433#post158454