I have a a4 thermal printer that worked perfectly fine before, but now it's not recognizing the paper size correctly. Even when I select the correct size in the print settings, the printer still gives an error and refuses to print. I'm seeking assistance from the forum community to troubleshoot this issue and find a solution to make my printer recognize the correct paper size once again.

That's why I don't do the printing myself, because I think it's better to turn to professionals. I recommend https://bannerprintingsanfrancisco.com/. They do small types of printing, as well as banners, signs, and much more. Everything can be ordered online and delivered. Convenient!