There is NO way to print a copy of your taxes WITHOUT the watermark AFTER you've Netfiled. Once you complete your taxes and BEFORE YOU NETFILE them, print a PDF without the watermark and then Netfile them. Another way is that you can go to "Forms" and select the forms you'd like to print, they are printed without watermarks.
Note, once you print a PDF, it will count the return towards the number allowed with your purchase but that wont matter as you are going to Netfile it anyways.
Thank you for choosing TurboTax.