My label printer. Horrible UI. How do I switch to capital letters? How to numbers? It can print two small lines instead of one, but how? It also has bold, italics, underline, but getting there is a game of trial and error.

And the display is not WYSIWYG, but just five or eight characters. You never know what you will get when hit the print button. And you cannot save labels you successfully designed - it just remembers the one in the system when you switched it off.