Blackout Duct w/Flange

thingiverse

This is a starting collar with an inner helix that allows for free airflow while canceling out most light. I only have a 200mm printer, so I am restricted to how tall I can build, but 300mm printers can print taller models with a longer helix which would definitely cancel out all of the light. Indoor gardeners know what light leaks can do to the success of a garden and this design is a great way to daisy chain various tents together, or just used for inlet and outlet air.