I wanted to place this filament dryer I got myself recently directly above my printer. So I designed and printed this shelf. It prints in parts to get as strong as possible and can be assembled using M3 screws. If you are interested, files are available here for free:
https://www.printables.com/de/model/539326-esun-trockenbox-wandhalter-esun-filament-dryer-wal
Here is an example of the difference between dried and not dried filament: