Had to check again,
Are each of those 2 grills cut at once?
If so, there are no artifacts on other cuts except the one in one side, and the oposite on the other grill.
Can you open it in Linuxcnc and zoom in on the part with defects to see if it is correct there? If all the other cuts are good and only that part comes out like that, that is sure to be the drawing.
