It's not the brand of Canvas, this happens I believe with all Canvas.
Oops... sorry, didn't mean to imply it was the canvas I was using.
You should not be having any issues with the width.
Correct. Width is spot on.
I did a little more experimentation last night. This is a bit of a strange animal and I think it may have some bugs. Here's what the manual says:
Feed Priority
Specify exact paper feeding, if desired. Normally, select Automatic . Choose Print Length if you prefer to feed the paper an exact amount. However, note that choosing Print Length may result in slight banding in the direction of Carriage scanning.
Adjust Length
Displayed if Feed Priority is Print Length .
Adjustment relative to the amount of stretching or shrinkage of the current paper.
Enter either the adjustment results from Print Pattern or the discrepancy that you measured (as a percentage).
For paper that tends to stretch, increase the feed amount by choosing a higher adjustment value. For paper that tends to shrink, decrease the feed amount by choosing a lower adjustment value.
So despite what the manual says, Feed priority was set to "Automatic" but the "Adjust Length" was still present. According to the manual it shouldn't have been. I changed the Feed Priority from Auto to "Print Length" and now it prints too long (also out of the +/- 0.7% range).
Now, here's another interesting tidbit, Media Type has an effect too. With the cheapo paper in there I tried changed the media type to see what would happen and reprinted the calibration page. It printed out at a different length. That leads me to believe that there's got to be a way to get this thing properly calibrated. I mean... if you think about it this problem would make it completely useless for producing technical drafts where the measurements need to be accurate. I'm just trying to avoid an extra step in post here.
Cheers, Joe