I made this model to hold a rectangular hygrometer in the empty center slot of the AMS since I do not use the other desiccant holders in those slots since I use https://www.printables.com/model/333828-spincycle-keep-every-spool-dry-for-bambu-x1-ams-an . This model fits nicely and can be removed without pulling out your spools. the slot for the hygrometer is fully open so that the rear sensor is not blocked.