KSP logo 40mm fan "guard"

thingiverse

I apologize for the wacky orientation. It's super easy to fix in your printer host. It doesn't really do much guarding, but it sure does look sharp! Straight from your favorite physics game! You may need to apply something to aid in the first layer adhesion, as there are a few sharp small angles. I had to spray a bit of hair-spray on my bed to prevent the extruder from pulling the nose of the rocket up as it printed it.