Mystery Ridge On 3D Print

Hello,

I am trying to print out a lid for a part. I've been printing it like a bowl (see the last picture), however a consistent ridge appears along the outer part forms. It is about the same width around, which means that the part isn't shifting. Has anybody had this problem and solved it?

Material: ABS, black
Printer: FF Creator X with glass bed and cooling fan
Software: S3D

Profile:
infill: 20%
support: none
outline overlap: 20%
Infill extrusion width: 102%
Cooling fan on
build chamber on (cardboard box)

Attachment 9612Attachment 9613Attachment 9614

Any chance you could highlight the issue in one of the images? Are you referring to the ridge shown in the first image that goes all around the object?