This is an often misunderstood aspect of the sun. The sun doesn’t need to pull oxygen into itself to burn. It just does a bit of fusion magic!

When a star is dense enough it starts to fuse Helium together through a process called the “triple alpha process”; which results in Carbon! From there it’s pretty direct for the star to fuse one more Helium to the Carbon via stellar nucleosynthesis to create Oxygen!

So you see, the Sun doesn’t need to draw Oxygen from space. It just makes its own!

I’m seeing quite a few strings there around the nozzle and fan ducts. Another thing that can cause that curling is wet filament, which will also cause the stringing. So you might also try drying it.

Do you see the same curling with other filaments?

This can sometimes be caused by uneven cooling. I was able to resolve it by using a fan shroud that cools on both sides of the print.