Noticed as I was assembling the new main light ring in ABS that the edge had lifted and it was a little warped, and the 0.3mm single wall print was a little too thin for my comfort.  I changed it to two wall and reprinted. 

I also noticed if I run the ABS as the absolute top of its heat range, like 275C, I get a flat black finish instead of more glossy.  Hey... I can use that.

So I reprinted the part light ring like that.  It is there to keep the light from hitting the mirror directly, so a flat finish is good.