I think the oxygen prevents solidification which is what stops the object from s...

		tim333 on March 17, 2015 \| parent \| context \| favorite \| on: Carbon3D – 3D Printing via Continuous Liquid Inter... I think the oxygen prevents solidification which is what stops the object from sticking to the screen they project the image on to. By the looks of it the oxygen just diffuses from the air through the screen.