After trying many suggested methods I use this technique.
1: Setup the paper size custom or 'standard'
2: Enter the Platen gap width: wide, wider...
3: Enter the paper thickness: Note each integer reps 1/10 mm or 4 mils, for a 20 mil thk canvas I use 5
4: Cut your canvas to size and place in the 'normal' rear auto slot (wear cotton gloves or use lint free cloth). Definitely brush/wipe your canvas 'clean', loose coating flakes, fibers or particulate matter will leave white 'pinholes' in your print. Many canvas media coming off a roll will exhibit a tendency to curl, especially so at the 4 corners. Flex the corners to be 'flat' preventing printhead 'rubs', mainly at the trailing corners where media is no longer held down by the rollers.
5: Gently press against the canvas, check for proper alignment along the right edge and press the 'preload' or 'eject' button (South pole of 'select' buttons)
6: When the feed cycle starts push canvas gently downwards, when the rollers grab let go. If the feed is successful the canvas will advance to the preloaded position. If not the roller noise will alert you, lift out the canvas and try again. With experience your success rate will be >80% for preloading the canvas!
A preloaded canvas will now feed and print properly >95% OTT! My experience.
7: Before pressing 'Print', recheck your print properties: media size, color/B&W, port or lndscp, etc.
During the print cycle observe the print's alignment progress, definitely for longer prints >20 in., include additional border space to allow for follow-up trimming.
The rotary cutter, Rotatrim (not inexpensive), is excellent for cutting sheets or slivers of canvas, don't even think of using a guillotine cutter on a finished print--a box cutter with a fresh blade is infinitely better.
8: When your print exits hang it vertically (regardless of size), placing the print on a flat surface creates an instant 'electrostatic' dirt magnet.
Everything I described above was gleaned from the generous members postings on this site and Naturescapes. Ditto for sealing and framing of your new canvas prints-your next set of tasks.
I hope you now feel encouraged to follow thru--B&W on canvas is awesome!!
irv weiner