Terrarium / Vivarium Bulkhead style vent

Low profile "bulkhead" style screw in place vents for terrariums/vivariums.

The mesh features 1.2 mm holes with 0.8 mm ribbing. Both the insert and nut have M28 threading with wide tolerances for easy printing. The low profile design is suitable for use on any containers with ~2mm wall thickness (or less).

A 1 1/8 inch hole saw makes the perfect sized hole for the vents

Everything will print as oriented without the need for supports.

Tested in PETG at both .2 and .15 layer heights (both successful).

On safety and longevity:

Both PLA and PETG plastics are generally considered food safe but some of the dyes and additives might not be, so I use "natural" colour to be safe.

I recommend printing in PETG long term since PLA is biodegradable and the presence of heat and water will cause it to break down (though from all accounts I've read, it will still last for over a year).
Disclaimer: I'm a hobbyist, and everything I've stated is based on personal experience and google search results; I recommend doing your own research and consulting professionals whenever possible.