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    Canon Pixma Pro-1 issue when printing 6x4

    I have recently returned from an oversea's assignment where I was away for nearly 3 months. During this time my Canon Pixma PRO-1 printer sat unused, and now has a very weird issue. I can print any print size except 6x4 faultlessly. However, when I print 6x4 I get these black marks, like a...