Primera LX610 Color Label Printer with Plotter & Cutter - Manual (Page 109)

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8. You are now ready to print. Click the Print icon to open the print dialog box.
9. The default label size is 8.5 x 11. You can see this is not correct by looking at the preview.
Always adjust the Paper Size to match the label stock size installed in the printer.
10. In this case we can choose a preset size (4x3) to match the label size installed in the printer.
Choose Manage Custom Sizes…
if your label size is not listed