WMS bin location labels cut off final row — ZPL label length & print width fixes

Joe B.

Expert ★★★★★ 27,853 satisfied customers

Specialities: Zebra ZPL/EPL, WMS/ERP label templates, bin location labels, ZD421/GK420d, DYMO, barcodes & print quality

Label truncation — last line missing, print area too short, ^LL label length, ^PW print width, ^FB wrap, ^FO field origin

Technician

Hey! We’ll stop your WMS bin location labels from cutting off the final row. I’ll check ZPL commands like ^LL (label length), ^PW (print width), and ^FB (block/word wrap), plus the ^FO field origin and ^LH label home. Which printer and media are you on — Zebra ZD421/GK420d with 4×2 or 4×6 thermal, or DYMO? And is the data coming from a WMS/ERP template (SAP/Oracle/NetSuite) or ZebraDesigner/BarTender?

Customer

Zebra GK420d with 4×2 direct thermal. The WMS sends ZPL. Our bin code is three lines (zone, aisle, shelf), but the last row is truncated or prints half-height at the bottom edge. It’s worse on long codes.

Technician

Classic truncation. Causes are usually: 1) ^LL label length is shorter than the content stack; 2) ^FB sets a line count that clips the last line; 3) ^FO/^LS positions push text below the printable area; 4) driver scales output; 5) the printer isn’t calibrated (top-of-form/black-mark) so it tears early. We’ll extend label length, set correct print width, and adjust the template.

Customer

Where exactly do I change those in ZPL? Our template uses ^A0N for font and some ^FB blocks.

Technician

Step 1 — Expand print area
• Add/raise ^PW812 for 4-inch heads (203 dpi: 812 dots ≈ 4″).
• Set ^LL400 (~2″ tall = 406 dots). Increase if you use big fonts or a barcode.
• Ensure ^LH0,0 and don’t push content off the bottom with ^LS.

Step 2 — Control wrapping with ^FB
• ^FBw,h,g,j,ls. For three lines, make h=3 and ensure ls (line spacing) is large enough (e.g., 30–36 at 203 dpi). If h is 2, the third line gets clipped.

Step 3 — Position fields safely
• Start each block with ^FOx,y leaving at least 10–20 dots margin.
• Avoid driver “fit to page” — send raw ZPL from WMS; in Windows driver, disable scaling and set label size 4×2 exactly.

Customer

We also print a Code 128 for the bin on the bottom. Sometimes the barcode chops off the human-readable text under it.

Technician

Add vertical space and set proper module width:
• ^BY2,3,60 (module width, wide:narrow, height). Increase height only if ^LL has room.
• Use ^BCN,60,Y,N,N and place HRT (human-readable) above or below with a separate ^FO so it won’t be clipped.
• Keep a bottom quiet zone (≥ 10–20 dots). If the barcode sits at y=360 on a 400-dot label with 60-dot height, you’ll clip it.

Customer

Could media calibration cause the last row to be missing? Sometimes it tears between rows.

Technician

Yes. Run a full calibration so the printer knows the gap/mark: hold the feed button during power-on (GK420d) or use the menu to calibrate media type (gap/mark), print speed, and darkness. Wrong top-of-form causes early tear-off and clipped final lines. Also verify you’re on Direct Thermal for DT stock (not Thermal Transfer).

Customer

Our template mixes ZPL and driver printing. Some PCs use the Zebra driver, others send raw ZPL. Could Windows scaling be the issue?

Technician

Mixing modes introduces scaling/truncation. Standardize on raw ZPL from the WMS or export ZPL from BarTender. If you must use the driver, set stock to 4×2, disable “fit to page”, and match ^PW/^LL. DYMO/EPL printers have equivalent settings (label length/printable area), but ZPL is most predictable for bin labels.

Customer

Any safe defaults so even very long bin descriptions won’t clip?

Technician

Use a resilient layout:
• Set ^PW812, ^LL420–440 for 4×2 to allow three lines + barcode.
• Text with ^A0N,28,28 (or scale to fit) and ^FB780,3,10,L,0 for 3 lines of wrap with 10-dot spacing.
• Keep barcode at least 80–100 dots above the bottom edge. If your WMS may send longer strings, truncate upstream or print a condensed font (^CI28 for UTF-8 if needed).
• Avoid ^FWR/^FWR rotations unless you recalc Y positions.

Customer

After raising ^LL and adjusting ^FB lines, the full code prints. Anything else to keep it stable across devices?

Technician

Final checks:
• Lock stock size and density in the driver; disable app scaling.
• Keep consistent darkness/speed to avoid smearing on small fonts.
• Store the ZPL template on the printer (Format Store) to eliminate PC differences.
• Document your ^PW/^LL/^FB values in the WMS so future edits don’t shrink the print area. Need help testing with sample ZPL? Open the chat.

Customer

Perfect — the last row prints every time and the barcode isn’t clipped. Thanks!

Technician

Summary: To fix WMS bin location labels cutting off the final row, set adequate ^LL label length, correct ^PW print width, use ^FB with the right line count/spacing, adjust ^FO/^LH positions, and calibrate media. Standardize on raw ZPL and 100% scale to prevent truncation across PCs and printers.

Quick answer: the accepted fix

Accepted fix when bin location labels cut off the last row: raise ^LL (label length), confirm ^PW (print width), set ^FB to 3 lines with adequate line spacing, reposition fields with ^FO/^LH, and run printer calibration. Disable driver scaling and print at 100%.

FAQ

Step-by-step (Zebra ZPL)

1. Set ^PW and ^LL for the stock (e.g., ^PW812, ^LL420 for 4×2 at 203 dpi).
2. Wrap text with ^FB (width near ^PW, lines=3, spacing 10–36 dots).
3. Position fields with ^FO and keep ≥ 20-dot bottom margin; verify barcode height/quiet zones.
4. Calibrate media; disable driver scaling; save template to the printer or WMS.

Note for mixed environments (macOS/Windows)

1. If designing in BarTender/ZebraDesigner, export ZPL and keep the same ^PW/^LL values in all drivers.
2. Test a long bin string and confirm no clipping in preview and on paper before rollout.

Sources

• Zebra — ZPL II Programming Guide
• Zebra — ^PW, ^LL, ^FB, ^FO commands
• Zebra — Media calibration (top-of-form)

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