The Quick Answer
If your Munbyn printer is spitting out a blank label between every print, you have a size mismatch. Learn how to fix calibration and driver settings.
Skipped labels are the quiet money leak of the shipping world. One blank between every print doesn't stop your day the way a red light does — so people shrug and keep printing, wasting a label with every order until half a roll has gone in the bin. If your Munbyn printer is skipping labels, feeding extra blanks, or ejecting two for every one it prints, the machine has lost its sense of where labels begin and end — and there are exactly four places that sense can go wrong.
I'll take you through all four, cheapest first, including a driver setting mismatch that mimics a broken printer so convincingly that I've seen it survive three "fixes" before someone finally checks it.
Quick-Fix Summary
In bench order:
- Recalibrate — the fix for most skipping, most of the time.
- Snug the guides and clean the gap sensor if calibration won't hold.
- Check the driver's label dimensions against a ruler — my uncommon tip.
- Inspect the labels themselves for odd gaps or marked backing paper.
Why Skipping Happens: One Number, Two Sources
Your printer decides where each label ends using two inputs: the gap sensor watching for the space between labels, and the stored label length it measured during calibration — cross-checked against the page size your computer's driver declares with every job.
When all three agree, prints land perfectly. When any one disagrees — a stale calibration, a blinded sensor, or a driver claiming your labels are longer than they are — the printer overshoots the true label boundary and feeds into the next one, ejecting it blank to "finish" the job. Skipping is never random. It's arithmetic done with one wrong number, and our job is finding which number.
Fix 1: Recalibrate (Start Here, Always)
Load at least four connected labels, press and hold the FEED button, release at the first beep, and don't touch anything while the printer runs the paper back and forth. Green light means it stored a fresh measurement.
Why this works: Calibration writes the label-length number the printer trusts most. A stale measurement — from the last roll, a failed earlier attempt, or a reset — makes the printer genuinely believe your 6-inch labels are 6.5 inches, so it feeds the extra half inch into label two and spits it out. New roll, new calibration, every time — even for the "same" size, because batches vary. This one habit prevents the majority of skipping before it starts.
Fix 2: Guides and Sensor
If calibration completes but skipping returns within a day or two, something is corrupting the printer's view of the gaps.
First, the guides: slide the green paper guides until they just touch both edges of the roll. Loose guides let paper wander sideways mid-feed, and a wandering gap slides out from over the sensor's eye.
Second, the sensor: power off and unplug, find the small sensor window in the paper path, and wipe it gently with a swab dampened in 70%+ isopropyl alcohol. Dry three minutes, recalibrate.
Why this works: The gap sensor is an eye, and eyes need two things — a steady subject and a clean lens. Guides give it the steady subject; the alcohol wipe gives it the clean lens. Intermittent skipping — fine on Monday, wasteful by Thursday — is the classic dusty-sensor pattern, because dust accumulates and shifts. Clean the lens and the mystery usually retires.
Fix 3: The Driver Dimension Mismatch (My Uncommon Tip)
Here's the cause that survives every calibration and every cleaning, because it doesn't live in the printer at all. It lives in a dialog box on your computer, and it's off by a quarter inch.
Grab a ruler and measure one label — actual sticker, top edge to bottom edge. Standard shipping labels are 4 x 6 inches. Now open your printer driver's preferences (Windows: Printing Preferences → Page Setup or Stock; Mac: the paper size in the print dialog) and read the label dimensions the driver declares.
I regularly find drivers set to 4 x 6.25, or a custom size someone created at 4 x 6.5 during a long-forgotten troubleshooting session, or a "4x6" preset that's actually 105 x 155 mm. The driver tells the printer "this job is 6.25 inches long," the printer obediently feeds 6.25 inches of paper — and the extra quarter inch pushes into the next label, which gets ejected as a blank so the next job can start on a fresh label.
Set the driver's dimensions to match your ruler exactly, delete any mystery custom sizes, and check the paper size inside your shipping app's print dialog too — the app can override the driver.
Why this works: The printer executes whichever length the job declares, and it has no way to know the driver is lying. Calibration can't fix this, because calibration governs the printer's own measurement, not the job's demand. This mismatch is my favorite diagnosis to demonstrate because the "repair" is deleting one wrong number — and the customer's face when a month of wasted labels traces back to a 0.25 in a dialog box is something I never get tired of.
Fix 4: Interrogate the Labels
Still skipping? Look hard at the labels themselves. Flip the roll and check the backing paper: some budget labels have printing, logos, or dark marks on the liner, and every dark mark reads as a phantom "gap" to the sensor — instant confusion. Check the gaps too: unusually narrow gaps (under about 2–3 mm) or inconsistent spacing between labels from a sloppy manufacturing run will defeat even a clean, calibrated sensor.
Test with a roll from a known-good brand. If skipping vanishes with the new roll, you've found your culprit, and it cost the price of one roll to prove it.
Why this works: The sensor can only be as honest as the paper it's reading. Marked backing and irregular gaps feed it false boundaries, and the printer skips or stutters trying to obey them. A control roll is the cleanest experiment in label printing — one variable, instant verdict.
When to Call a Professional
Escalate when a clean, calibrated printer with verified driver dimensions still skips on a known-good brand-name roll — at that point the gap sensor itself is likely drifting or failing, which is a component fault. Email Munbyn support with a video of a print-and-skip cycle plus a photo of your driver's page-size settings; that pair usually gets a quick verdict, and sensor failures under warranty typically end in replacement. Out of warranty, weigh the repair against a new unit honestly — and against the labels you're burning while you decide, because at a blank per print, waste adds up faster than people think.
FAQ
Why does my Munbyn print one label then feed a blank one?
The printer believes your labels are longer than they are — either a stale calibration or a driver page size set larger than the physical label. Recalibrate first, then measure a label and check the driver's dimensions match exactly.
Why does my Munbyn printer skip labels only sometimes?
Intermittent skipping points to a dusty gap sensor or loose guides letting the paper wander. Clean the sensor with isopropyl alcohol, snug the guides, and recalibrate.
Do I need to recalibrate for every new roll of the same size?
Yes — it takes ten seconds and prevents most skipping. Label dimensions vary slightly between manufacturing batches, and the printer trusts its last measurement completely.
Can cheap labels cause skipping?
Absolutely. Marked backing paper creates phantom gaps and irregular spacing confuses the sensor. Test with a quality roll before blaming the printer — it's the cheapest diagnostic you can run.
A Munbyn printer skipping labels is doing math with one wrong number, and your job is finding whose number it is: the printer's (recalibrate), the sensor's (clean it), the driver's (measure and match), or the labels' (test a good roll). Check them in that order and the leak stops — usually at step one, occasionally at that sneaky quarter inch in step three, and almost never at the repair shop.
