Why nothing happens with I try to print? (AM-243-BT)

Reason:

Printer is connected to a new USB Port：
Open your "Control Panel" -> "Printers and Devices" and note which Label Printer is "active".
It may be Label Printer, Label Printer (Copy 1), Label Printer (Copy 2), etc.
Then be sure to print to the same active printer name when printing.