Don't set the value too high in you cad software - if the line segments are say 5 per mm it will drastically slow down your print because of how Marlin (the firmware) works.
Marlin can only read 12 moves ahead and doesn't know if a sharp turn (e.g. corner of square) is coming up on the 13th move so it has to be ready to stop 12 moves ahead and if all 12 moves are in the next 3mm it needs to print VERY slow. It will cause bad quality.
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JohnFox 25
I suspect you are seeing the sides of the polygon which approximates to the circle. I use Sketchup for design which assumes a 24 sided circle, which you can see the sides. I now set the number of sides to 99 and these are now invisible.
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