This DarkSide vent is designed for AC Infinity 4x4 tents with rectangular velcro vents approximately 15" wide and 6.5" high. It may work with other tents, but print at your own discretion. 

It blocks light that can damage flowering plants. Matte black PLA is highly recommended, but regular black PLA will suffice. Two frames (left and right) and two light baffles are required to complete the set. 

You will also need 1" wide Velcro tape with both hook and loop sides. I added a carbon filter mat to mine to capture dust; these can be purchased online very cheaply in large sections or rolls. 

ENABLE SUPPORTS!!!!!!!… there are magnet holes on the bottom side! I added these 9mm holes in case anyone wants to use them to hold filters in place or add other accessories. Assembly is straight forward. The two sides attach via the male and female dovetails. Light baffle inserts drop in with a fairly tight tolerance. If you want a carbon filter then cut it to size, drop it into the rectangular cutout with the lip around the perimeter and place the baffle insert on top.