HP Deskjet 3745 Color Inkjet Printer - Manual (Page 39)

4. Click a custom paper size name in the Name drop-down list.
5. Type the paper dimensions in the Width and Length boxes.
The minimum and maximum paper dimensions appear beneath each of the
boxes.
6. Click the unit of measurement: Inches or Millimeters.
7. Click Save to save the custom paper size.
8. Click OK to exit the Custom paper size dialog box.
HP Deskjet 3740 series printer
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