I'm going to disagree with everyone above saying it doesn't really matter and instead say you should absolutely write your seed phrase by hand and not use a printer.*

You say you would type it in a notepad app and then print it. By doing so, there are multiple ways your seed phrase could be stolen. Keyloggers could steal it, or screen capture malware could steal it. Even if you delete the notepad file after you are done, unless you actually write over those sectors on your hard drive then the data isn't erased, and is vulnerable to being stolen by malware or anyone with physical access to your computer. Almost all modern printers keep recently printed documents in their memory, and again, your seed phrase could be extracted this way.

mocacinno has outlined how difficult it is to be absolutely sure something you print remains completely secure. It isn't easy. What is easy, though, is bypassing all of that and just writing it down by hand. Yeah, some people might call me paranoid, but I've never lost as much as a single satoshi, and why take the risk for literally no benefit?

*Unless you really know what you are doing, but if you are asking this question, then you probably don't (no offense intended).