Sunlu S2 Filament Dryer Vent

The Sunlu S2 has the same drawbacks as their S1 and other filament dryers. The humidity gets trapped in them as the filament dries out so you need to prop open the lid to effectively dry your filament.

I drilled four 4mm holes at the top of the lid (be careful not to hit the heating coils) and hot glued this cover over them so I can open or close the vents. You may want to do this on both sides of the lid for better airflow.