Pretty straight by eye… but when you measure it looks like it is warped a bit. Exaggerated it looks like this:
I went around in a 1000 by 1600 rectangle (same as I calibrated with, frame 3083 by 2691) with a 6 mm end mill so it should have come out 994 high and 1594 wide.
Looks like if I cut one of the puzzle pieces closer to a corner they will be 0.2% bigger in the Y direction and 0.125% in the X direction, compared to the middle. The lines straight thru the middle up and down and side to side (like cross hairs) were pretty much straight and I was able to go way beyond the calibrated area. Easily 200 mm out side it and it kept straight.
On the corner outside the calibrated (and green) area I ran into bumps from hitting the uprights by exceeding the 140º or the 130º…
All in all they looked pretty good though
