To BEGIN

Go to FILE > PRINT

Choose your printer from the Printer drop down menu

Then click PAGE SETUP

PAGE SETUP DIALOG

Choose your printer from the "Format For" drop down menu

Under "Paper Size" choose "Manage Custom Sizes". The below dialog will appear

(make sure to choose the right paper orientation for your print job)

OSX may not handle custom paper sizes correctly. It is system and printer specific and may not happen to you. If it does, your margins will probably be off. Come back to this dialog box and adjust the Printer Margins. This may take some experimentation but is necessary.

Define a custom paper size.

Important Tip - the smaller paper dimension is ALWAYS the width. The larger dimension is always the height.

MARGINS - Read Carefully!

Start by setting all margins to 0.15" at minimum. You can come back and adjust if necessary, but do not go below that number.

Now name and save the new paper size for later use.

* Canon Note

Most Canon printers can only print up to 23.39" long. Setting your paper size over this maximum will likely cause random print errors from OSX