A family of Microsoft relational database management systems designed for ease of use.
Grinding through it one at a time, unless you want to try writing some VBA that opens each report in design view, and alters some properties via the Printer object. I'm not really sure this would work; I have only done this at runtime. Typically most reports should be set to "Default Printer".
Maybe it would be quicker to revert to a backup from before the snafu happened?