First run on a tumbler 20 oz. I did the test on another, this was the best setting. I can still see tiny marks. Should I have made a second run, or change direction of the laser?
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What are you using for an interval and split size?
I see .072 as the Interval. I do not see a split size, do not know what drop down it is on.
Split size in is the rotary gui… I think you get better results with the split size being a multiple of the interval…
This is the notes window…
this is all I have for my rotary setup.
I’m sorry, for some reason I thought you were using a galvo machine. Those are the only ones that have a split size… I apologize.
I’ve never run my rotary on any of my grbl machines… so I’m not going to be of much help here…
Thanks for trying! 
Hang in there… there are plenty of people with great knowledge on these to help you out.
Good luck