I had to file for my deceased grandson so could not net file. Is there a way to print a previous return without the "do not mail" on it?

Hi @Kim-hare 
Thanks for your message. Unfortunately, there is no way to print a copy of previous year taxes without the watermark after they've been NETFILED.  This is a safeguard that was put in place from the CRA to stop people from using both the NETFILE and print and mail services, which resulted in duplications at the assessment level.