Dymo LabelWriter 400/400 Duo/400 Turbo/400 Twin Turbo - Manual (Page 28)

Printing Labels Using Smart Paste
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4 Select Smart Paste, and then From File from the Edit menu.
The File Open dialog box appears.
5 Navigate to and open the file you exported as CSV or text.
A dialog box appears telling you how many labels will be printed.
6 Click Yes. The labels begin printing.