When you print an invoice or letter in TM3, the date and the title 'TM3' get added to the top of the printout. The location of the template also gets added to the bottom of the printout. This is highlighted in red in the image below.
To remove this, click More Settings when the print preview screen appears.
This brings up the 3 extra options shown below. You should untick 'Headers and footers.'
This then removes the TM3 title and date from the top and it also removes the template location at the bottom which you can see in the image below.