How do I fix zebra gap sensor not working?

Usually a size or calibration mismatch. Set the artboard to the real roll, calibrate the printer, then send one test from the free browser app.

Do I need ZebraDesigner or a paid license?

No. Design in the browser and print with Zebra Browser Print, or export PNG, PDF, or ZPL. No desktop designer seat.

Should I reprint the whole roll while testing?

No. Print quantity 1 until the label looks right, then run the rest.

Zebra gap sensor not working

Published: August 17, 2026 · 3 min read · Problem

Do this in the free app: app.mylabelmaker.com. No signup. Design the label, then print on a Zebra or download PNG / PDF / ZPL.

When the gap sensor fails, labels skip, feed long, or the printer thinks it is out of media. Clean the sensor window, set the correct media type, calibrate. Open the free label maker to do it now.

Good to know: Do not pour alcohol into the sensor well. A damp swab is enough.

How to fix it

Open the free label maker. No signup.
Set the label size to the exact width and length of the roll in the printer.
Calibrate the gap or black-mark sensor if you just changed stock.
Print one test label. Do not send a whole stack until it looks right.

Black-mark stock

Some 4×6 fanfold is black-mark, not gap. Gap-sense on black-mark stock looks exactly like a “broken sensor.”

Print or save

After the test looks right, print the rest from the same design. Save a JSON copy so you can open it again later.

Fix it in the free app

Set the size, print one test label, no account.

Open free label maker