The idea is this would eliminate the need for an expensive ziplock bag & consumable desiccant.  It would continuously dry the filament every day.  The lion kingdom tried leaving filament in a window & it absorbed water at night while releasing water during the day.  It seemed to have a net absorption of water in the winter while it might have released water during the summer.

The idea is the container would continuously measure dewpoint inside & outside the container while heating the container as much as possible with absorptive material.  When the dewpoint inside is higher than outside, it opens an inlet.  When the dewpoint inside is lower than outside, it's air tight.  The sensing & actuating could be manes powered to save space & make sure all the solar radiation goes to heat.  There could be a fan to improve circulation.