any one know how to print on canvas with a ink jet printer?

Answer 1

The canvas needs to be pre-treated with a special coating to allow the water based inks to print (it's similar to coated paper treatment). Alternatively move up to a printer that uses spirit based inks.

Answer 2

I do not know if you can really print on canvas with most other printers. You may want to check out HP's:
HP Photosmart Pro B9180 Printer
Overview

Professional pigment-ink photo printer with individual ink tanks, precise color accuracy and archivability. Superior color management and controls for gallery-quality, durable photos and prints on a wide range of media up to B+ size prints.


Features


Professional photo quality with archivable inks
• Print gallery-quality photos and fine art prints with archivable, pigment-based HP Vivera Inks.
• Exceptional durability—waterproof photos resist fading for more than 200 years.
• Get black-and-white photos with perfectly neutral gray tones and deep black shadow reproductions.
• HP's high-capacity individual ink cartridges are ideal for high-volume printing efficiency.


Get precise color management—print after print
• Get consistent, accurate color with HP densitometric closed loop color calibration.
• Water resistance and color stability, plus fast-drying photos with HP Advanced Photo Paper.
• Easily print photos fast using included Adobe Photoshop plug-in.
• HP Color Center tool effortlessly guides you through color management and printing.


Impressive performance on paper, canvas and more
• Superb print speeds—up to 13 x 19 inch less than 1.5 minutes, 4 x 6 photos in as fast as 10 seconds.
• Print on a variety of photo and art media up to 1.5 mm—including stiff pre-matted paper or canvas.
• Get a range of sizes—from passport and panorama to 13 x 19—with or without borders.
• Conveniently print multiple size photos—without having to swap paper—using front bypass tray.

Hope this helps a little.