I've done this to myself too. I once had a thermal receipt printer I wasn't using, so I decided to point a webcam at it and put it on a webpage so anyone could print random crap to it (it's actually still up - alnwlsn.com/printer). Of course I went in knowing full well what I was getting into, and the types of messages posted to it are about what you expect and get here. Some highlights:

- It was once found by one of those worse-than-4chan places, who spent about 4 hours spamming the worst things you could imagine until it ran out of paper. I added some filtering after that to stop tons of duplicate messages from wasting so much paper and some regex, which reduced the volume of some particularly vile things. Some people do post nice messages too.

- The setup breaks often. Eventually, I'll notice and fix it, but it might have been broken for months. Inevitibly, there will be people using it again within days, with no announcement made. How enough people find it on this tiny corner of the internet is a mystery to me, but they do. I am convinced most of them are real people, because why even bother to point a bot at it?

The whole point was that I thought it would be more interesting than letting the thing sit around on a shelf, and to use up the box of rolls that came with it instead of throwing the whole thing in the trash. Intersting it is; I don't think I would describe it as plesant, but it is interesting.