Find your macOS version and the exact printer model
In Apple menu → About This Mac, note the macOS version and your Chip or Processor. Check the printer’s full model number, including its final letters. Use those details to choose software and a connection. A maker’s instructions for a related printer may describe a different driver or wireless mode.
| Printer’s supported route | Where the job goes | What to confirm |
|---|---|---|
| AirPrint on your network | macOS print dialogue | Exact model supports AirPrint and offers your media size |
| USB with a macOS driver | macOS print dialogue | Correct model package, operating system and data connection |
| RW403B desktop Bluetooth | MUNBYN Editor in Chrome | Browser can find the model and the editor previews the file correctly |
AirPrint gives you a network print route on compatible devices. Brother lists it for the wide QL-1110NWBc, which still uses the printer’s supported DK rolls. If you want a USB workflow with the MUNBYN RW403B, MUNBYN’s current setup page points to its Mac driver and identifies a newer package for macOS 27. Match the package to your own system and check any chip requirements published for it.
Open-format labels with app printing
MUNBYN RealWriter RW403B label printer, white
A practical starting point for a dedicated parcel-label position using compatible open-format direct thermal stock. Choose USB for the supported desktop route or follow MUNBYN’s current phone-app instructions for Bluetooth printing.
Keep in mind. Bluetooth needs the supported application and file workflow. It does not establish Wi-Fi or AirPrint support. Leave room for the fanfold stack or an appropriate external roll holder.
- 4 × 6 inch label workflows
- USB / Bluetooth app printing
- Open-format direct thermal media
Add the correct printer in Printers & Scanners
For AirPrint, complete the printer’s network setup first. Open System Settings → Printers & Scanners. If the device is absent, choose Add Printer, Scanner or Fax, then select the printer and check that AirPrint is the software in use. For a network printer already listed, verify the name and connection so you can recognise the right destination when you open Preview.
For USB, connect and install in the order the printer maker specifies. Use a cable or adapter with a USB data connection. MUNBYN’s instructions for the RW403B show connecting the printer and running its macOS package. Once the driver is installed, return to Printers & Scanners and confirm the printer appears. If you need to add it manually, choose the software the manufacturer specifies for the exact model.
On an Apple silicon Mac laptop, a newly connected accessory may prompt you to allow the connection. Unlock the Mac and allow the accessory if you recognise it. A printer can have power while the Mac is still waiting to permit USB data.
For RW403B Bluetooth on a Mac, use MUNBYN’s documented Editor in Chrome. Pair inside the editor and check the preview there. The steps below apply to a job sent through the macOS print dialogue.
Print the postage PDF from Preview
- Download the original label from the carrier or marketplace. Open it in Preview and identify the page for the parcel.
- Press Command–P. Select your label printer before choosing Paper Size. If the PDF includes a receipt or instructions, select just the postage page.
- Choose the size of the stock loaded in the printer. Exact 4×6 inches is 101.6 × 152.4 mm. A 100 × 150 mm setting is for a different size, and a Brother DK roll has its own dimensions.
- Check orientation and scale using the carrier’s print instructions. Review the preview for the full barcode, address and surrounding margins. Start with one copy.
- Compare the printed label with the original. If the preview is correct but the label feeds off-centre or skips, follow the printer’s loading and calibration instructions before adjusting the PDF.
If the paper menu offers Manage Custom Sizes, you can define the supported dimensions of your stock. Check the printer’s specification and margins before doing so. A custom size gives the print dialogue a page size. The printer and driver still determine which stock and printable width are available.
Preview offers scaling options, including fit choices that can crop or resize content. A full A4 document shrunk to a thermal label can make the postage panel too small. When the service offers a dedicated thermal PDF, start with that file. Use the service’s A4 output and A4 print workflow when that is the only format available for the order.
Save the settings after the first good print
Once you have a correctly sized label, use the print dialogue’s Presets menu to save the current settings if available. Name the preset after the printer and stock, such as RW403B 4×6 parcel labels. This is useful if you switch between a desktop A4 printer and a thermal printer during the same day.
Recheck the destination, paper size and page range before using a preset with a new file. If you change label dimensions or move to a different queue, check one print and save a separate preset for that setup.
Identify a Mac connection, queue or layout fault
The printer is missing. For AirPrint, verify the network and confirm the printer is awake. For USB, check the data cable, any accessory permission and the manufacturer’s driver. Try reconnecting the cable directly to the Mac if a hub or adapter may be involved.
The job stays pending. Open Print Centre and view the queue for the selected printer. Look for a paused job, an offline status or an old job ahead of the label. Cancel any duplicate job before trying a single page again.
The barcode is clipped. Reopen the source PDF and compare the preview against it. Check paper size, orientation, scaling and the printer’s printable margins. If the label shifts from print to print, inspect how the stock feeds and recalibrate according to the printer’s instructions.
Apple and manufacturer setup instructions
Checked in November 2026.
- Apple identify Apple silicon and allow USB accessories
- Apple add and manage printers, choose a paper size and manage jobs in Print Centre
- Apple print PDFs from Preview and save print presets
- MUNBYN RW403B Mac USB setup and desktop Bluetooth editor
- Brother QL-1110NWBc AirPrint and media specifications
Common questions
Does a Bluetooth label printer automatically work with the Mac print dialogue?
Check the model’s documented workflow. The MUNBYN RW403B uses its macOS driver for USB printing. MUNBYN documents desktop Bluetooth through its Chrome editor, which sends jobs through a separate interface.
How do I know if my Mac uses Apple silicon?
Open Apple menu, then About This Mac. A Chip entry with an Apple chip name indicates Apple silicon. An Intel Processor entry identifies an Intel Mac. Check the printer maker’s software requirements for your chip and macOS version.
Why can’t I see a 4×6 size in Preview?
Select the label printer first because available paper sizes come from the chosen queue. Check the driver or AirPrint options against the stock. If the printer supports the dimensions and macOS offers custom sizes, add a matching size.
Can I print only one label page from a multi-page PDF on a Mac?
In Preview, open Print and choose the page or range you need. Check the thumbnail, recipient and copy count before sending the job.
What if the printer lights up but my Mac cannot find it?
Use a USB data cable and check both ends. On an Apple silicon Mac laptop, unlock the Mac and allow a known USB accessory if prompted. Then verify the vendor driver and look again in Printers & Scanners.