I did a little workshop at #LGM19 this year called "When In Doubt, Print it Out". We had a lot of fun playing with bar-code scanners and small receipt printers. I finally got around to tidying and documenting things enough to make public:
https://gitlab.com/bhowell/50-shades-of-grayscale

If you're doing work with #screenless interaction and #smallprinters it might be a useful starting point.