Spool holder and drybox for Enclosure V21  with humidity sensor downward facing position
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Spool holder and drybox for Enclosure V2.1 - with humidity sensor (downward facing position)

This version 21 of the spool holder is with a downward facing rectangular hole for a humidity sensor ...

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Spool holder and drybox for Enclosure V2.1 - with humidity sensor (downward facing position) alternatives