Snap In Vent

Snap in air vents for a water barrel lid (inexpensive garbage barrel type). Drill a 2" hole through the barrel lid or whatever else your project happens to be. Cut a 3.5" by 3.5" square of nylon screen or netting. Snap the larger ring through the outward facing side, place the screen material over the inside and snap the retaining ring on to lock it all in place.

Designed for PLA filament with no supports. Apply to a 2 inch hole through thin plastic material. Scale as needed on your slicer for variations in your application.