I have one question with regards to these comparisons. In version 0.9.9 all the extrusion widths are 0.67mm. In version 1.1.7 the perimeter extrusion width changed to 0.40mm while the rest remained at 0.67mm. Then in version 1.2.7 the perimeter extrusion stayed at 0.67mm and a new EXTERNAL PERIMETER EXTRUSION WIDTH was added with a setting of 0.40mm??? I don't know enough about these definitions other than to point out that we now have an External perimeter extrusion width in addition to a perimeter extrusion width. Apples and oranges??