We don't have access to your printer driver settings so can't advise directly. I will say that it can be tricky dealing with multiple variables within Visio AND the printer driver to get the output you want.

I recommend you print the file to an Acrobat file (PDF) which will fix the output to a single page. Then you can open the PDF and print that file to your plotter. This will make the scaling a bit easier as you are removing some of the complexity and reducing the variables you can tweak as you print.

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Andrew Lockton
Chrysalis Design, Melbourne Australia