Fix:
You can clean the head with some isopropyl alcohol and q-tips and your prints should look flawless again.
In my case this never actually fixed it, because halfway through a test print page they reappeared again, but finally I found a permanent solution.
What to do if cleaning the head doesn’t work?
I found out that, if when you clean the head blobs appear instantly again, its caused by the roll having dust (although its not visible on visual inspection)
To clean it get some cello tape, but make sure its the ones that don`t leave residue
Make a loop and start going through the paper feed roll, like when you remove dust from phone screens before applying a screen protector. Dust(and other gunk) should stick to the tape, leaving you the roll clean.
Having particles probably changed slightly the paper position, making it be too close to the head and the ink from it accumulated on the resistances of the head.
After cleanup your prints should be in mint condition again!
Wow I was unaware that those exist! They seem to have Isopropyl Alcohol.
Looks like they are meant for the head, but its good that they worked for the roll for you. In my case I even washed the roll with water (that should remove dust) but didn’t work. The cello tape did thankfully.
I wasn’t aware of the issue the roll could gather contaminants - so we both learned something - I print often but have moved up to a bluetooth printer that is 80mm wide print… still have not linked it directly to the Dev Term…
Thanks for sharing this detailed fix — the tape method for cleaning the paper roll is actually a great tip. A lot of people focus only on the print head and forget that dust on the roll can affect paper positioning, which then causes those blank lines to come back.
One more small thing that can help after cleaning: run a full test print to make sure the lines are completely gone across the entire page. Sometimes short prints look fine, but longer prints reveal the issue again halfway through.
If anyone needs a simple page to check consistency after cleaning, you can print a quick test page from here: https://myprinttest.com/ — it helps confirm whether the head and paper feed are working evenly from top to bottom.
If your thermal printer is printing blank lines, there are a few things you can try. First, check the thermal paper to ensure it’s properly loaded, as misalignment can cause printing issues. Next, clean the print head with a soft cloth and some isopropyl https://tropical-casino.com/ alcohol, as dust or residue can interfere with printing. If that doesn’t help, check the printer’s settings for any misconfigurations, like print density. Lastly, make sure the driver software is up-to-date, as outdated drivers can sometimes cause glitches. If the problem persists, the print head may need replacement.
