If you print your seed on a paper, it may leave a file on the system(PC or Laptop) where you are printing which is not safe. Writing seed on a paper using a pen is also safe.
So, do you usually write down a paper wallet including the private key and the QR ?
Seems to be quite a lot of work.
Printing can under some circumstances leave traces, that's true.
Old print jobs might be accessible long time after the print job is done.
That's why it is recommended to print from a live booted USB distro and to use a non-network printer with storage for print jobs.
You can use a printer without leaving traces, but a few extra steps have to be made.