Problem
Item labels printed on the Dymo 450 or 450 Turbo have barcodes that are blurry, not crisp, or otherwise not able to be scanned by a digital scanner.
(NOTE: Normally, the default settings on a Dymo 450 or 450 Turbo printer will suffice for printing your item labels, but if it is determined that the barcodes are not scannable, then this article explains how to adjust for better printing and scannable barcodes.)
Solution
Open the Printer Settings on your computer or device.
PC (Windows 10)
Click the Start button
Select Settings
In the Settings menu click on Bluetooth and Devices
Click on Printers & Scanners
MAC
Apple Menu
System Preferences
Printers & Scanners
Click on the appropriate printer, then select manage
Select printing preferences
Select Paper/Quality tab
Select Advance
Confirm label size and change (if required)
Under Graphic, select Print Quality and change it to 300 x 600 dots per inch
Under Print Features, change from "Text only" to "Barcodes and Graphics" (if necessary)
Under Print Features, change Print Density to Medium or Light (if necessary)
Apply and Save the Settings