The hard bit here is that, like all ESC/POS libraries, they can’t speak in my LX-350’s reduced subset of ESC/P commands, it’s expecting to control a receipt printer.
It’s mostly fine. But with things like image printing, I’ve had to bodge the library to get some line spacing.
And I haven’t got the text size options working yet, but I think it’s sending slightly more advanced commands for it so I’ll bodge around it.