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Officejet3830
Microsoft Windows 10 (64-bit)

I am trying to print onto a 6" x 6" birthday card (so full size is 6" x 12").  I have followed the link given to set custom size, but the printer does not show that in the selection of paper installed.  Each time I print, it gives an error, ' Paper size mismatch: The paper size detected by the printer sensor does not match the selected paper size'.  I have tried different paper sizes in the selection on loading but none seem to work.  I have managed with different size card stock.

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