Remember that, when printing from the browser, you must use https, localhost o It won't work on sites without HTTPS nor localhost with a different port than 80 (which is the default ) nor IP. If you want to print on the local area network, check:How to print on a network printer
If the examples are not working, make sure that:
  1. The plugin is running in the background. Download it from:
  2. Your printer is shared and has a friendly name as indicated in:

Print on thermal printer from any programming language

Finally a free plugin to communicate with thermal printers (ESC POS) from any programming language.
Navigate through the menu to learn more
Take a look at the intro post:
Check this video to learn how to navigate on the examples:

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