Zebra QL420 Plus 4" Mobile Thermal Printer - Issues with print quality

This Zebra QL420 Plus has some vertical lines in the print. It is sold as-is with no warranty. Photos are of the actual unit (stock no. ZB-13).

Condition - (1.7 / 4)

Case / housing	Good - normal scuffs and wear from use (3/4)
Port covers	Port cover(s) missing or broken (1/4)
Print quality	Poor print (1/4)
Battery	Battery included. It charged and held charge in testing (85% at test). This model doesn't report battery health, so it isn't graded.

Testing

• Tested 18/10/2026: restored to Zebra factory defaults and test label printed - result: PASS
• Firmware: SHCQL11z74
• Battery charge at test: 85% (7.92 V)

Specifications

Brand	Zebra
Model	QL420 Plus
Type	Mobile / portable label printer
Printing technology	Direct thermal (no ribbon needed)
Resolution	203 dpi
Maximum print width	4 in (104 mm)
Printer languages	ZPL, CPCL
Connectivity	USB (tested). Bluetooth
Colour	Monochrome
Serial number	See label photo

What's included

Printer and battery, as pictured

Please note

• The printer has been reset to factory defaults, so any Bluetooth settings have been cleared and will need setting up for your network or app.
• Only the items listed above are included.
• Sold for parts or repair, as-is.