A Polaroid Pogo bluetooth printer (you can even see the MAC address in the source...) which I was given by a couple of friends for a previous wedding photobooth project. It turns out that you can use Zink papers for the Pryntr range (or the slightly more expensive HP Sprocket) in this unit without any modifications. However, it won't print .png's so the source code is modified to save as .jpg.
In addition to the hardware listed, you'll also need to prepare your Pi with drivers for the screen. I used the ones from goodtft:
https://github.com/goodtft/LCD-show
Since the framebuffer doesn't auto-copy itself to the SPI display, you will also need the framebuffer copy util from @tasanakorn. I've included the binary I compiled on my Pi in this folder, but if you need to re-compile the source is here:
https://github.com/tasanakorn/rpi-fbcp
See the original blog post here for details https://anotherpiblog.blogspot.com/2017/06/raspberry-pi-photobooth-with-bluetooth.html
***The Pi Photobooth*** by [Mari DeGrazia](http://anotherpiblog.blogspot.com/) is licensed under a [Creative Commons Attribution 4.0 International License](http://creativecommons.org/licenses/by-sa/4.0/).