Have you tried setting the print scaling to 1 page width & height? If you have, and a portion of the page remains unused, that's because your worksheet doesn't require a full page when scaled to fit. If you have spare width, you can try increasing the column widths. Conversely, if you have spare height, you can increase the row heights. In either case, choosing a different font can both improve legibility without an increase in point size and, depending on the font, allow a larger point size. For example, if you have spare height, changing to Arial Narrow will allow a larger point size than, say, Arial, without increasing the overall width.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]