“Label prints cut in half” — thermal print pipeline fix
Joe B.
Expert ★★★★★ 27,853 satisfied customers
Specialities: Windows/macOS, Zebra ZPL/EPL, Rollo, TSC/TSPL, Brother QL, shipping workflows (UPS/FedEx/ShipStation/Shopify)
Half-printed labels — diagnose the pipeline (app → driver → language → printer)
Technician
Technician
• Driver page set to Letter/A5 instead of 4×6 (100×150mm).
• Browser printing with “Fit to page” instead of Actual size 100%.
• Mixed languages — app sends ZPL but driver converts, or vice versa.
• Incorrect ZPL ^LL (label length) or ^PW (print width).
• Printer media length/calibration lost; tear-off/home wrong.
We’ll correct each stage — app → driver → printer — then save it.
Technician
1) In Chrome/Acrobat print dialog: Scale = Actual size (100%), no “Fit”/“Shrink to fit”. Orientation = Portrait for 4×6.
2) Windows → Printers & scanners → Zebra ZD420 → Printing preferences: Paper size 4.00×6.00 in (100×150mm), Print quality/speed default, Darkness moderate.
3) Preferences → Advanced: Disable “Reduce image”/“Edge to edge” options that rescale. Apply. Print one test — if still half, we fix the printer side.
Technician
In ZPL, set
^PW812 (4.00 in @ 203 dpi) and ^LL1218 (6.00 in). If the template uses metric, that’s ^PW832/^LL1279 for 300-dpi models.ShipStation/Shopify usually embed these, but if the printer stored another size it can override. We’ll reset the printer’s stored values and save the right ones.
Technician
• Load 4×6 gap labels. Clean platen quickly if glossy.
• Button calibration: hold Feed until two flashes → release. Printer feeds/learns gaps.
• In Zebra Setup Utilities → Configure Printer Settings: Media Type = Gap/Notch, Print Width = 4.00 in, Label Length = 6.00 in, run Manual calibration and set Tear-off/Home = 0 (fine-tune ±10 later).
• Send
^XA~JC^JUS^XZ to save calibration and lengths so they persist after power cycling.
Technician
• Windows spooler hiccups: set Spooling to “Start printing after last page is spooled” and “Print directly to the printer” OFF.
• Networked Zebra: use Standard TCP/IP Port RAW/9100 (not WSD). For macOS CUPS, use AppSocket/JetDirect.
• Avoid generic PCL/PS drivers. Use Zebra’s ZDesigner or RAW ZPL.
• USB hubs and long cables can drop data; test direct USB.
If a job truncates, the printer finishes the current buffer and cuts the label in half.
Technician
• Rollo/TSC (TSPL): set page 100×150mm, run Auto detect, ensure “Prevent adaption”/scaling is off, and set Gap sensor. TSPL equivalents:
SIZE 100 mm,150 mm and GAP or BLINE for black-mark. • Brother QL: choose 62×100 mm (or 4×6 DK roll), disable “Fit to paper”.
Across brands, the cure is: correct page size, correct language, calibrated sensor, and saved length.
Technician
1) App: Actual size 100%, 4×6 template, Portrait.
2) Driver: Paper 4.00×6.00 in (100×150mm); correct model driver.
3) Language: use native ZPL/TSPL; avoid conversion.
4) Printer: Calibrate media, set length 6.00 in, width 4.00 in, save
^JUS. 5) Transport: RAW/9100 or direct USB; stable spool settings.
Follow these and the “label prints cut in half” issue disappears.
Technician
Quick answer: the accepted fix
Accepted fix for labels printing cut in half: set driver page to 4×6 (100×150mm) and print at 100% Actual size; in ZPL use ^PW812 and ^LL1218; run media calibration and adjust tear-off/home; save settings (^JUS) and use RAW/9100 or direct USB for reliable spooling.
Typical symptoms & the setting that fixes them
Top prints, bottom missing → increase label length (ZPL ^LL) or set page 4×6. Bottom starts on next label → wrong length/driver page or “Fit to page.” Stops mid-label → bad spooling/WSD port; switch to RAW/9100. Random drift → recalibrate media, clean platen, save settings.
How to verify the fix
Print a Configuration label — confirm Width 4.00 in / Length 6.00 in and correct sensor (Gap/Mark). From Chrome or Acrobat, print a UPS test at Actual size. From a ZPL app, send a template with ^PW812 and ^LL1218. If both complete at full height with clean cut/tear, the pipeline is healthy.
Pro tips — bulletproof thermal pipeline
Keep one standard: 4×6 page, native language, saved calibration.
Lock driver defaults to 4×6. In browsers, disable “Fit to page.” For mixed fleets (Zebra, Rollo, TSC), keep separate queues and avoid generic drivers. Embed ZPL size (^PW/^LL) in templates. After cleaning or media changes, re-run calibration and save. Lower speed a notch if heavy graphics cause pauses.
Disclaimer: This information is AI-generated and intended for general guidance only. For advice specific to your environment, please consult a verified expert on Whizz-Tech before making decisions.
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FAQ
Why are my thermal labels printing cut in half?
Driver page isn’t set to 4×6, app is scaling, ZPL length (^LL) is wrong, or the printer lost media calibration. Fix those and save settings.
What are the correct ZPL size commands?
For 203-dpi: ^PW812 (width) and ^LL1218 (length). For 300-dpi: ^PW1181 and ^LL1772. Always save with ^JUS.
PDF prints are half; ZPL is fine — why?
Browser or Acrobat likely scaled to “Fit to page.” Use Actual size 100% and ensure the printer’s paper size is 4×6 (100×150mm).
Do network ports matter?
Yes. Use RAW/9100 (JetDirect) or direct USB. WSD can drop/segment jobs leading to truncated labels.
How do I make the fix persistent?
After calibration and sizing, store settings to the printer (Zebra: ^JUS or “Save to Printer”) so they survive reboots and media changes.
| Symptom | Likely cause | Quick fix |
|---|---|---|
| Top prints, bottom missing | Wrong label length | Set 4×6 in driver; ZPL ^LL1218; save ^JUS |
| Two halves across two labels | Scaling/tiling; wrong page size | Actual size 100%; page 100×150mm; Portrait |
| Stops mid-label randomly | WSD port/spooler or USB hub | Use RAW/9100; stable spool; plug printer direct |
| Gradual shift after a few labels | Lost calibration / dirty platen | Recalibrate media; clean platen; adjust tear-off |
Step-by-step (Windows/macOS)
- Browser/Acrobat: choose Actual size 100%, Portrait.
- Driver preferences: set Paper 4.00×6.00 in; correct model driver.
- If using ZPL, embed ^PW812 and ^LL1218.
- Run printer media calibration and set Tear-off/Home = 0 (then fine-tune).
- Save settings (^JUS / “Save to Printer”) and use RAW/9100 or direct USB.
Optional: advanced checks
- Windows Spooler: “Start printing after last page is spooled”.
- CUPS (macOS): install Zebra/Rollo driver; AppSocket/JetDirect.
- Lower speed/darkness for dense graphics to avoid buffer stalls.
Sources
- Zebra Support — Printers & Setup Utilities
- Chrome/Browser printing — scale settings
- ShipStation — Label format & printer setup
- Rollo — Auto detect & page size
Filed under: Label / thermal / POS / shipping labels
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