To share a model, simply email either the Excel file directly, or export the areas of the file that you want to a PDF.
Note that exporting to PDF is an Excel feature that doesn’t specifically relate to the Excel model itself. Here are some resources to show you how to convert an Excel file to PDF or print:
Printing the portions of a given Excel worksheet requires setting the print area and then sizing the print area to fit in one (or more) pages.
Here’s a basic tutorial on how to do this in Microsoft Excel: