Borderless printing isn't available when using custom paper sizes.
Create custom paper sizes
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Select Print from the File menu to open the Print dialog box.
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Select your model name, then Preferences or Properties. The printer driver setup window appears.
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Select the Page Setup tab.
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In the Page Size field, select Custom.
If you select Photo Printing on the Quick Setup tab, the Custom Paper Size setting isn't an option.
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In the Custom Paper Size dialog box, enter the following:
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Select OK, then OK again in the Page Setup tab.
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Select Print.