Addition to the Filament Dry Box: https://www.printables.com/model/634289-filament-dry-box-cheap-and-simple for the round version of the Hygrometer :)
My Hygros: https://www.amazon.de/-/en/dp/B07JG9QZ2B?psc=1&ref=ppx_yo2ov_dt_b_product_details