Are you having trouble with the thermal printer labels not scanning?
Are you having trouble with the thermal printer labels not scanning?
I purchased a direct thermal printer recently, a brand new MFLABEL DT426B. Although it's a more affordable choice, it received positive feedback. The newest drivers were installed smoothly on my desktop, connected via USB at my home office location, and it produces white 4x6 labels that look EXCELLENT.
I've encountered difficulties with barcode scanning at the post office (two different offices today as well). Perhaps only a couple out of twenty scanned correctly. I considered reaching out before trying to contact the eBay seller, who now appears to be in China, or contacting the manufacturer for support, or submitting a replacement claim through my protection plan. If nothing else, I'd rather not become that customer returning items that aren't needed, and I'm outside (at least during the eBay return period).
After some research, I've tried:
- Adjusting printing preferences: darkness levels between 8 and 15 (I used 8, 11, 12, 14, 15), print speeds of 2, 3, and 4 in/sec, dithering off throughout.
- Modifying print preview settings: scaling labels down to as small as 65%.
Interestingly, changing the scaling above 70% didn't significantly reduce label size. I saw a forum suggestion to scale down to about 85% for similar problems, and labels scanned better at 65-70%, even though they appeared full-size or close. This was tested with a few scan attempts using random package tracker and barcode apps—my Pixel 3A struggled with the USPS app (it's "built for an older Android version"), and I don't own a dedicated barcode scanner.
At this point, I suspect either low-quality scanners at two post offices or the fact that the labels come with minimal protection. On the other hand, it's been a while since I've worked in any field involving them when they're not already on the package. How opaque are these typically? I often reuse shipping envelopes and sometimes have to cut out multiple blank sheets to hide the original label. I'm wondering if cheaper brands might be more transparent or if other options exist. A return label for a work shipment seems almost as see-through when stuck to the corner of white paper with text, so I'm not ruling it out just yet, but I'll try another label and possibly buy something else.
Also, since I've had ongoing issues after adding 3-4 blank sheets before printing the label, wouldn't it be noticeable if the paper was too thin or the machine wasn't calibrated properly? If that's possible with direct thermal printers, it might be a different issue altogether. Coming from a high-end commercial printing background, I know transfer pressure matters a lot depending on stock thickness and texture—barcode labels seem to behave differently.
Looking forward to any advice!
Have you cleaned the printer?
Thermal printers tend to accumulate dirt because the paper coating mixed with dust can adhere to the printhead. Use printhead wipes to remove any buildup on the metal printhead and along the paper roll path. This should be done each time you install a new roll.
I have found cotton swabs soaked in alcohol to be effective.
The dirtier the printing rolls, the more dirt accumulates inside the printer.
Have you experimented with different labels?
Thermal printers differ from inkjet or laser models in that they don’t use ink, making paper quality crucial—especially for shipping labels.
They work by applying heat to melt the label coating on paper or materials.
If the label coating (such as wax or resin) is of poor quality, the prints will be of low quality.
I have, and mine suggests the same as indicated on the label inside. It mentions 100% alcohol on a cotton swab. I use 91% for stripping paint from old scale models, thinking 70% is acceptable and attributing it to a language misunderstanding about needing a cleaner with full alcohol content. But I'm not sure. Thank you for your question; I won't forget to mention it and will update my post. I have a roll of another well-reviewed brand tomorrow and plan to test them. I wasn't certain the coating issue was the main problem. Thanks again!