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Thermal Printer Settings for 4x6 Shipping Labels (Windows and Mac)

Correct thermal printer settings for 4x6 (100x150 mm) labels: paper size, scale, darkness, speed and gap calibration. Fix small, cut-off or blank labels.

By Jignesh, Founder of CropMyLabels · Updated 28 Sep 2026 · 5 min read

Over 90% of label printing problems — such as cut-off edges, faint lines, or skipped blank stickers — are caused by incorrect printer driver settings rather than the PDF itself. Once you configure these four driver preferences, every label will print centered and crystal clear.

4x6 Thermal Printer Driver Setup Diagram Printer Printing Preferences — Crucial Settings 1. Stock / Paper Size 100 × 150 mm Do not leave on A4 or Letter (prevents cutoffs) 2. Scale / Page Sizing Fit to Printable Area Enlarges cropped sticker to fill 100% of paper 3. Darkness / Density 10 – 12 (or 65–70%) Dark, high-contrast barcode with crisp edges 4. Sensor Calibration Media: Die-Cut / Gap Hold feed button 3s after changing rolls
Configuring these 4 driver settings once guarantees that every shipping label prints centered, sharp, and without skipped blank stickers.

One-time printer driver configuration (Windows)

  1. Open Windows Settings → Bluetooth & Devices → Printers & Scanners.
  2. Click your thermal printer and select Printing Preferences.
  3. Under Page Setup / Stock, click New and create a paper size:
    • Name: 100x150
    • Width: 100.0 mm (or 4.00 in)
    • Height: 150.0 mm (or 6.00 in)
  4. Under Graphics / Options, set Darkness (or Density) to 10–12.
  5. Set Print Speed to 3.0 or 4.0 in/sec. Lower speeds ensure sharper thermal transfer on barcode lines.
  6. Click Apply and OK.

Everyday browser print dialog settings

When you click 'Print' or open the cropped PDF in Chrome or Edge:

  • Destination: Choose your thermal printer.
  • Pages: All.
  • Paper Size: Select the 100x150 stock you created.
  • Scale: Select Fit to printable area (or Fit to Paper).
  • Margins: None.

How to calibrate the label gap sensor

If your printer skips stickers or prints across the gap between two labels, the optical sensor needs to be recalibrated:

  1. Ensure label roll is properly loaded with the guides snug against the edges.
  2. Power off the printer.
  3. Hold down the front FEED button while powering on the unit.
  4. Release the button once the indicator light flashes red/orange. The printer will feed 2–3 labels to measure gap distance and stop precisely at the tear line.
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