Daids Fanduct with hall-o+magnet mount for autoleveling

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I've modified Daids fanduct to include a mounting system for the Hall-O sensor and a designated spot for the accompanying magnet. The magnet is precisely positioned 4mm above the Hall sensor's detection field, where an approaching ferromagnetic build plate will alter the magnetic field. This change triggers the Hall sensor's response, which can be detected by the Arduino and translated into a consistent signal corresponding to the distance between the printhead and bed. This setup effectively enables auto-leveling capabilities.