/diy/ - Do It Yourself

I've noticed this issue in the past but never really cared up until now; what's with the bulge when there's new "features" on certain layers? Here it's just a sharp transition at the radius because it's like that all the way to the top but I've noticed something similar on other parts, e.g. I have a hole or some other thing on a part and the layers that make up the hole will ALL be bulged out. Most of the things I've found about this suggest it's ringing, which it's plainly not, or ghosting, which... vaguely makes sense, if it's on part of a layer, which this isn't. The wall thickness is the same throughout this piece.