Font Tab (Axes)
The Stroke dropdown box allows you to specify the font type for the annotation.
Chart3D.ChartArea.Axes.Item(ii).AnnotationFont.Stroke
The Size textbox allows you to specify font size for the annotation. The size is specified in thousandths of the PlotCube’s length. For example, a value of 80 means that the characters are 8% of the PlotCube length.
Chart3D.ChartArea.Axes.Item(ii).AnnotationFont.Size
The TrueType textbox lists the font type and font style being used by the annotation. The ellipsis button to the right of the textbox opens the font browser.
For more information, see Choosing Fonts.