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Zebra label printers such as the ZD421d, ZD420d, ZD220, and GK420d need to be configured with the correct paper size before printing shipping labels. The paper size should be set to 102x192mm or 100x150mm depending on the labels you are using.
The Zebra label printers are installed on Mac like any other printer. Make sure to select the Zebra ZPL Label Printer driver.To configure the paper size:
  1. Open a test label in the Preview app
  2. Select Print
  3. Under Paper Size, select “Manage Custom Sizes…”
  4. Press + to add a new size
  5. Specify the custom paper size:
    • Width: 102mm
    • Height: 192mm
    • Non-Printable Area: User defined
    • Top: 0 mm, Right: 0 mm, Bottom: 0 mm, Left: 0 mm
  6. Double-click the paper size to rename it to “102x192mm”
Once configured, select that printer when printing shipping labels.