What is MYOB?
MYOB is a very common accounting package
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I am not familiar with that application, so I cannot comment on how it creates PDF files. In general, if the application does have a built-in PDF generator, you should be able to also save the PDF files directly, without the need to print to PDF. Printing to PDF usually creates lower quality PDF files because your page content first has to be converted to PostScript, and that PostScript then gets converted to PDF. Lower quality in this context has nothing to do with resolution, so that alone should not be the cause for the fuzziness you are seeing. This is usually caused by using the wrong PDF conversion settings. This is something you can select when you use the "Adobe PDF" printer. It is possible that you have the output resolution set too low. See here for more information about how to change this: