Came back to say I was able to solve my problem (in case anyone else experiences this). I opened up the driver on my computer, and saw the printer had a B200 error. In my case, I'm guessing this is because the print head was idle for "too long." I had let it sit a week after initial setup, when...
My problem is a little different than the others here, but this is by far the most informative discussion I've seen on this printer!
I just set up my Canon Pixma Pro-1 for the first time. (Apparently this printer has been sitting around for years, unused, at my job.) I installed the print head...