For Thermal Printer bulk label printing,
Need to download and install QZ printer utility updated (2.0.9 ) for printing ZPL labels. Use this file (Click Here) to setup for print invoice & labels via a thermal printer.
Some marketplace gives data in ZPL format data as a label. The common marketplace is Cloudtail, Amazon flex. So we print a label with the help of a thermal printer.
Note: The printer should have a resolution of 300 DPI or greater