How to make ps-postscript-app working with thermal printers

I am currently trying to make Custom thermal printers working on an Ubuntu Core instance running cups and ps-postscript-app snaps. I have understood that PPD files have to be snapped into printer applications, but I didn’t find the right way for doing it. Can anybody point me out any documentation or “how to guide”?

This is the thermal printer I am working on: https://www.custom4u.it/pages/product/index.php From this page you can get PPD and CUPS filter files.

Starting from ps-printer-app yaml file, I’ve successfully snapped PPDs and filters for my thermal printers. I’ve put PPDs in usr/share/ppd/ directory and filters in usr/lib/thermal-printer-app/filter/. However, when I try to add the USB connected printer I get “Unable to use that driver” error message. Is there anything I am missing for making it works?

perhaps @till.kamppeter as the maintainer of the cups snap can give you some hints into the right direction here …