: Always select Labels or Heavyweight/Cardstock as the media type in your printer driver. This slows down the feeding process and ensures the toner fuses correctly to the clear film without the sheet slipping.
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Your word processor is applying a "Gutter" margin. Go to Layout > Margins > Custom Margins > Set "Gutter" to 0". This is a known Microsoft Word bug when using third-party label templates. Simon labels template 12025 flint