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.
The author hasn't provided the model origin yet.