Gembox uses the same rendering engine to print or saving to a PDF. This engine does not handle the text that is rotated in the worksheet. Currently Gembox ignores the Rotation property during saving as PDF or printing to a printer. We would like this feature so that we can print our rotated text correctly. That way, the print engine provides more of a WYSIWYG type output.
This feature request has been implemented and is available in the latest versions of GemBox.Spreadsheet.