Several checks:
- Just saying...Ribbon sometimes is placed in the wrong sense and it doesn't print.
- Verify the settings at printer driver. Download a powerful Driver from here:
http://www.nicelabel.es/downloads/nicelabel-designer-pro/?uid=10004, and test the darkness option by printing with different measures at each time.
- If that doesn't work, we can check it again, but you should first test this options.
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