I am engraving a circular groove for a glass dome to rest in but I keep getting a deep groove at the top of the circle. As the laser works around the circle it comes to a brief pause at the top of the circle but continues burning while stationary and the end result is a deeper linear groove.
this could be due to backlash - check your belts are tight and the pulleys fastened properly on the steppers. Also pictures help 
ok - thats not backlash
screenshot of cut settings?
It would be interesting to see what the preview looks like. Also, would you be willing to upload the lbrn2 file for us to have a look at?
It doesn’t look like you are using “normal” fill function. Send your settings or the file otherwise it will just be guesswork.
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