High quality on a thermal printer depends on three factors: darkness (density), resolution mode, and media type.
Solution: Your print head pins might be dirty. Use a standard cleaning card or isopropyl alcohol. Additionally, go back to the driver settings and increase the "Impact Density" to Level 3 (Heavy). High quality on a thermal printer depends on
Thermal printers often produce perfect barcodes easily. Impact printers, due to physical dot pins, can struggle. The "High Quality" setting in the Epson Advanced driver increases the dot density and slows the print head marginally to ensure that every vertical line of a Code 39 barcode is solid and uniform, reducing scan errors. After saving, run Epson OPOS Setup Utility to
Below is a snippet of an OPOS configuration file (.ini) that ensures high-quality linking: due to physical dot pins
[TM-T81]
LogicalName=TM-T81_HQ_39Link_UniqueIdentifier_123
DriverName=EpsonOPOSADK.DLL
PortName=USB001
DeviceType=POSPrinter
PrintDensity=95
GraphicsMode=1
Resolution=203
Dithering=ErrorDiffusion
PageMode=1
AutoCutter=PartialCut
After saving, run Epson OPOS Setup Utility to validate the link.