About radii and sizing (no replies)

Hi,

I have a question relating to shapes within OpenSCAD defined by radii and rendering with respect to the 3D printer nozzle.

If I specify a cylinder with radius 5.0mm, is that radius point placed at the centre of the printer nozzle?

Would this mean that a cylinder representing the interior of an object will actually print with a size of (2 * radius) - line width. Which for my aforementioned example would be (2 * 5.0mm) - 0.5mm = 9.5mm (for a 0.5mm line width)?

Regards,
Neil Darlow