Still pulling the typewriter apart. Have discovered a few exciting things (Exciting? Well, if you're reading this post you'll probably find them exciting too...) but in the meantime, I've made a little thing to grab RSS feeds and squirt them out to a serial terminal. Tested with an old thermal printer and working well.
Check it out: https://github.com/fuzzball5000/rss/blob/master/rss.py