Hi all,
I have contacted the kind folks at Red River Paper and Drew Hendrix has kindly advised the following and it works a charm for borderless printing with custom sizes on the Pro 1000. Note that I was using RRP's Arctic Polar Satin.
By Drew Hendrix and shared with his permission:
The PRO-1000 allows for borderless 10x12 and 13x19. We'll use those sizes for this hack.
Step 1
Go to your printer's control panel:
Go to Various Settings > Device Settings > Paper Related Settings > Det. Paper Setting Mismatch
Disable that function by choosing "No".
You will be back at the Paper Related Settings submenu. Choose "Advanced Paper Settings"
From that menu, choose the media type you pick in the printer driver when printing with the 8x12 and 12x18 paper. For this tutorial I'll choose Pro Luster.
In the menu for Pro Luster, scroll down and select "Detect paper width". Turn that function OFF.
What that is done go back to the home menu.
STEP 2
On your computer go to System Preferences > Printers and Scanners > Canon PRO-1000 > Options and Supplies > Utility Tab
Open the Printer Utility
In the Custom Settings Tab check both boxes, "Don't detect mismatch..." and "Disable paper width detection..."
Click Apply
STEP 3
For an 8 x 12 image file:
Make a blank 10x12 file, same resolution, in Photoshop.
Drag your 8x12 onto the 10x12 and center it so that there are two white stripes on either side of your image.
STEP 4
Begin the print process. Click on Print Settings. Choose the 10x12 (borderless) option in the Paper Size drop down menu.
Choose your media type, print quality, etc. The media type MUST MATCH the setting you edited on the printer's control panel for this to work.
Click SAVE to go back to Photoshop's print dialog.
There will be white space on two sides, borderless on the other two sizes.
PROVIDED you set up everything as above, the printer will accept the paper, fed through the auto-loader, and give you a borderless 8x12.
The same setup should apply to 12x18 using the 13x19. The Photoshop file will have the image against the top so with a 13x19 file, you will have white space on the bottom and a little space on the sides as well.
The only catch is the trailing edge. The printer may not print all the way to the trailing edge. If not trimming the white edge will be your quickest solution.
So that's it for printing at least with 8 x 12 and 12 x 18 custom paper sizes on the Pro 1000. There is as Drew has mentioned on the last line, a little trailing edge and its about 1-2mm and easily trimmed off.
Hope this helps anyone who wants to go this route.
Cheers
Han