For the Rollo wireless printer. Always ensure that you are connected to the same WiFi name and the same band 2.4Ghz or 5Ghz.
This is not an official Rollo support site, for the official support site, please visit: support.rolloprinter.com
Some merchants or online selling platforms generate their labels with very small letters and thin lines, rendering the barcode un-scannable; however, adjusting the speed and density/darkness of the print will substantially enhance the label's quality.
For Mac
In your browser or app press the Command ⌘ + P or the print button to open the Print Preview window and click "Print using system dialog"
Look for drop down menu under "Printer Features".
For Windows
You may access these settings by going to your
Control panel
Printers and Devices
Right Click on Rollo
Printer Preferences
Settings
Adjust your speed and density, start with the speed of 3 and the density of 10, then adjust your density incrementally until you achieve the desired output