Heres How to Set a Default Printer on the Mac
If you have access to multiple printers, you probably know that you can choose one from the Printer pop-up menu at the top of the Print dialog. But macOS has a feature that should make it so you don’t have to switch printers manually as often. Open System Preferences > Printers & Scanners, and look at the bottom of the Print view. The Default Printer pop-up menu lists all your installed printers, plus an option for Last Printer Used. That last one makes sense if you print a number of documents to the big office Canon, switch to printing images on the Epson photo printer for a while, and then switch back again. But if you primarily print to one printer, choose it from the Default Printer pop-up menu. You can still switch to another printer in the Print dialog anytime you want, but your main printer will always be the default.
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