I was struggling to keep filament stored in the Eibos Cyclopes dry. The other filament holders did not get enough humidity out. I designed this desiccant holder to mount to the top of the cyclopes and still allow the vents to be opened and closed. I printed in clear so I could easily see the color of the desiccant. The Inner ring gets loaded with desiccant and then threads into the Outer ring. Then an M5 bolt and washer go through the center hole to attach to the top. You can rotate the ring from outside the dryer and open and close the vents. Happy Printing.