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If you are experiencing issues with the label printer printing blank labels in between printed labels, or it is having other related issues with printing (but is still attempting to print labels), try doing a recalibration on the printer. If the label printer is not printing any labels at all this article may be more helpful.
Here is a screenshot from the Zebra printer manual on how to perform a recalibration:
Here is a link to the Zebra printer manual itself (Recalibration is on page 37):
Zebra Label Printer Manual