Troubleshooting: Poor print quality on Dymo Label Printers
If you have a Dymo electronic labelmaker with very light, incomplete, or striped printing, try the following:
Replace the existing batteries with a new/fresh set of alkaline batteries. The print head requires a significant amount of battery power to ensure proper printing on the label. Light print on the label may be an indication that the batteries need to be replaced.
Try a different tape, it may be that the tape may be old or faulty
Using the special brush supplied with your labelmaker (located on the inside cover of the cassette compartment) or a cotton swab with a soft solvent (e.g. rubbing alcohol), carefully clean the transporter roller and print head. Dust, dirt, or glue may accumulate on the rubber transport roller or print head inside the cassette compartment and adversely affect print quality.