Round Hygrometer to Spool Adapter
thingiverse
Stop that hygrometer from rolling around in your dry box or bag! Adapts the hygrometer using a 49mm shoulder which it tightly snaps into, then adapts it out to any spool with a center hole with at least a 50mm diameter and roughly a max diameter of 60mm. Made to adapt these popular round hygrometers to sit in a spool: https://www.amazon.com/dp/B07GR65CNT
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