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MAXIFY GX4020 How to set a customer paper size


Each time I try and load paper into either the rear or manual tray, the UI pop's up with a paper mismatch and asks me to confirm what the paper is, and gives me a pre-set list to choose from.

How do I create a custom paper size to add to this list? I've looked through the UI, the web UI, the canon inkjet smart connect app, but can't find it. The custom paper size I want is 6x9 ( half of s 9x12 craft paper sheet ). One of the selling points was the manual feed at the rear that was supposed to let you print on thick paper sizes other printers can't handle.

Using Mac OS X 14.2.1 (Sonoma)