db112358

I noticed exactly the same thing. My 18mm desired outside diameter prints as 17.8mm and my internal desired diameter of 10mm prints as 9.8mm due to material contraction. I added a horizontal offset of 0.4mm to exaggerate the effect and ended up with 18.6mm outside diameter and an internal diameter of 9mm. It's no coincidence that both dimensions moved exactly 0.8mm as Cura has added an offset edge of 0.4mm to the outside wall but has also added an 0.4mm offset to the inside wall making the hole smaller. The only way to do it is to perform non-uniform scaling along the X and Y axis in the scale settings rather than use the horizontal offset. It is clear that Cura is adding an