How can I connect an App Inventor app with a thermal label printer?

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FAQ Section: Printing

ESC/POS Simple Converter Extension - Daniel K. Experiences with the Jimdo.com ESC/POS Converter - @Bob_Holden [PAID] Thermal Printing extension (Bluetooth/Network) - mmnettime Printing in ZPL from text blocks - David_S, Juan_Antonio, Peter, ChrisWard Reference Material Epson ESC/POS(R) Reference Manual Defunct Image Print Extension - ILoveThunkable (missing)