This is a minimalist Hydrometer holder for us in the Bambu Lab AMS. This is for a panel-mount style Hydrometer with a panel cutout diameter of 42mm (such as sold here: https://www.amazon.com/dp/B0C3767NVS?psc=1&ref=ppx_yo2ov_dt_b_product_details). The stand uses less than 5g of filament but holds the hydrometer nicely so it saves on cost but also leaves the back of the hydrometer wide open for measuring humidity in the air of the AMS. Personally printed out of PLA and it perfectly fits the bill.