If you see text being cut off despite having the proper margins set in the print preview, check to confirm that the page is not zoomed in and is set to the default of 100% before clicking the print button.
For example in the page below, Google Docs had a slight zoom (110%) which when going to print the page was messing with the margins, upon restoring the page back to its default of 100% zoom and refreshing the page the print margins were restored and there was no longer a cut off.