Window Vent Slot Lid
thingiverse
This is a lid designed specifically for the vent slot located below windows. Its primary purpose is to prevent insects like bumblebees from nesting inside. I haven't had a chance to test it yet, but the V1 version effectively seals off the vent slot completely. In contrast, the V2 version allows a small amount of air to pass through while still keeping pests out of the slot.
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