Epson WorkForce ST-M3000 Monochrome MFP Supertank Printer - Manual (Page 150)

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You see a screen like this:
5. Select the printer or printers you want to add.
6. Click Add to Printer Folder .
The selected printer or printers appear in the lower section of the screen.
7. Select the checkbox next to the product you want to make your default printer, if necessary.
8. Click OK .
Parent topic: Printing with the Epson Universal Print Driver - Windows