I like the holder design, but my holders would just spin in place as the spool turned. This TPU grip increases friction causing them to spin and desiccant to move.
Holder - https://www.printables.com/model/576578-bambu-lab-ams-universal-spool-center-desiccant-hol
The author remixed this model.
Add-on grip to increase holder rotation and thus desiccant exposure to humidity.