Very low cost on-board humidity control system

For a "Dollar store humidity excluder" put a large Ziploc freezer bag over the filament reel as shown in the picture. Shove a couple of silica gel desiccant bags into the reel hub. Close the zipper as much as possible leaving a small unzipped area where the filament emerges. Place a couple of sachets of dessicant near the unzipped part of the bag at the base of the spool holder support.

Not a perfect solution to high humidity in the printer environment, but the price is right.

The build