A: Limited. There is no official macOS driver. Use a generic ESC/POS driver via CUPS or run Windows in a virtual machine.
Thermal printers rely on heat. Open the printer cover and clean the glass print head element using an isopropyl alcohol wipe to remove accumulated adhesive residue or paper dust.
If the driver is sending data but the labels feed through blank, it is often a sensor calibration or driver sizing issue.
An outdated or missing driver can stop your printing workflow instantly. If your computer cannot communicate with your Easy Print ES-9930U thermal label printer, you need to install the correct driver software.
If you want, I can:
Click the button (the "+" icon). Select the ES-9930U from the list.
Correctly maps pixels to ensure your shipping carriers can scan your barcodes.