Page Setup and Printing
Printing your OmniFocus data is pretty straightforward: set up a window that contains exactly the data you want by focusing, selecting items in the sidebar, or expanding and collapsing rows in the main outline. Then choose Print from the File menu. OmniFocus resizes the content to fit horizontally on the paper you've chosen.
For more control over how your data is printed, choose Page Setup from the File menu, then choose OmniFocus from the Settings pop-up menu for OmniFocus-specific settings.
Completion checkboxes — you can choose to print the checkbox for each action (to differentiate between completed and incomplete actions, or if you like to have the box to mark off with a pen).
Completion style — you can choose to print completed actions with their completed action style applied (a strikethrough by default).
Window title — Add the title of the window to the top of your printed document.
Date and Time — Add the date and time of printing to the top of your printed document.
Convert to black & white — Ignore OmniFocus's color styling and draw all text in black on a white background.
Rows — You can collapse all to show just the top level of the hierarchy, leave as displayed to use the expansion as it is in the window on your screen, or expand all to expose the collapsed rows.
Notes — You can hide all to put away the notes regardless of their visibility on the screen, leave as displayed to use the note visibility as it is on the screen, or show all to expose the notes for everything regardless of their visibility on the screen.
To print on unusually-sized paper:
Choose Page Setup from the File menu.
Make sure the Settings pop-up menu says Page Attributes.
Choose your printer from the Format for pop-up menu.
See if the paper you want to use is listed in the Paper Size pop up menu. If it is, choose it and print normally. If it isn't, choose Manage Custom Sizes to create it.
If you change the Page Setup for a window with a perspective open (you can tell because the perspective's name appears in the window's title bar), those settings are saved with the perspective. This means you can print your errands perspective on index cards in black and white at 120% scale and with no extra columns, print your weekly review perspective in full color on landscape-orientation letter paper, and so on.
The Perspectives window has a special Quick Print button 
at the bottom. Just select a perspective and click it to bring up the Print panel for that perspective; then you're just a click away from your printed perspective. If you trust that the settings are right and you don't even want to see the Print panel, Command-click the button to print right away.
at the bottom. Just select a perspective and click it to bring up the Print panel for that perspective; then you're just a click away from your printed perspective. If you trust that the settings are right and you don't even want to see the Print panel, Command-click the button to print right away.