Filled circles - flashes VS arcs

I am working on a project with Gerber fabrication files. I noticed that KiCad has two different ways (as per the Gerber specification) to plot filled circles.

When you create a circular pad using the “Add Pad” tool in footprint editor, it comes out as a flash in the Gerber.

When you use the “Draw Circle” tool, and select the “:ballot_box_with_check: Filled shape” option, that circle is plotted as two separate arcs, that when overlapped, together form a filled circle.

Why is this? I would’ve thought that selecting “:ballot_box_with_check: Filled shape” would result in a flash of the graphical object in the Gerber output. Thanks!

[EDIT] Screenshots below show the resulting circle when you use the “Draw Circle” tool with fill selected.


Two arcs are used to work around a bug when using 4.6 mm Gerbers in old CAM350 versions that many fabs in China still use.

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I see, thanks. The reason why I am asking, is becasue I want to create a circular flash on a layer other than top or bottom copper. From my experimentation, Gerber flashes only result from creating a pad?