Hi Robertprouse.
While the TS9521C is not designed specifically for 3" x 5" note cards, it may be set as a custom paper size. Depending on the coating/absorbency of the note card, it may take extra time to dry after printing.
By default, any paper size other than letter size, or media type other than plain paper, will print to either the rear tray or, if set to do so, from the tray (i.e. printable CDs, sticker sheets, etc). If you wish to print plain paper from the rear tray, ensure the rear tray is set to letter-size/plain paper (see Loading Paper in the Rear Tray) and that the rear tray is set as the feed source (Windows / Mac OS).
If you need immediate assistance with this issue, please call us at 1-800-OK-CANON (652-2666), Monday - Friday 8:00 a.m. to 8:00 p.m. ET (excluding holidays).
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