Bob,
Will send you the files later today. I have run a number of other files as well. The small dots that fill in appear to move slightly as the file progresses, e.g., the dots toward the ends of the file seem to be more in line with the outline (outline is drawn last on most of the artwork I do). I plan to draw a box around the outside of the random dots so I can see if the files move off as they process. Most of the dots are drawn and outlined from the top right to the bottom left. If I draw a box around the dots first I can see lines of dots shift as the file progresses. I will run the file before I send it to you to make sure it show the problem.
The cutting board Gcode file drew the first few letters, then drew the different parts of the black wreath, and then drew the other letters. Each part of the wreath is drawn and outlined separately. I suspect each part of the wreath was a little off from the previous part.
I have checked the machine to see if there was any play in it. Also, I cleaned the mechanical mechanisms just in case. I would suspect if something were loose or jamming it would not have a error on both axis - but you never know!
As I mentioned before these are really big Gcode files. They are much bigger than a 4'X8' sign with wood grain that I would make on the same machine. This would mean a small error would show up more often.
Also, I ran a file with the following - Rapid 50, acceleration 7, and feedrate at 20 and I had approximately the same offset as the second random dot pattern.
P