Brother MFC-J6945DW Ink Cartridges
Your Brother MFC-J6945DW uses the LC3337 / LC3339XL ink cartridge series, a four-colour individual ink system featuring black, cyan, magenta, and yellow. We have been supplying high-quality consumables for this printer since Jun 2019, helping workplaces sustain heavy print queues without interruption. Business environments typically see heavy black ink depletion due to text-based documentation, alongside steady colour use for reports. Because this office workhorse relies on separate ink tanks, you only ever need to swap out the specific colour that runs low, avoiding ink wastage during intense print runs.
Expected page output and replacement cycles
Real-world page outputs depend heavily on daily document complexity, though Brother calculates these ink capacities using the international ISO/IEC 24711 inkjet standard. Heavy text layouts deplete the black tank rapidly, making the high-capacity options more resilient against premature low-ink warnings during critical business print jobs.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| LC3337BK | Standard | Black | 3,000 | $0.015 |
| LC3337C | Standard | Cyan | 1,500 | $0.030 |
| LC3337M | Standard | Magenta | 1,500 | $0.030 |
| LC3337Y | Standard | Yellow | 1,500 | $0.030 |
| LC3339XLBK | High Yield | Black | 6,000 | $0.012 |
| LC3339XLC | High Yield | Cyan | 5,000 | $0.028 |
| LC3339XLM | High Yield | Magenta | 5,000 | $0.028 |
| LC3339XLY | High Yield | Yellow | 5,000 | $0.028 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
Genuine vs compatible cartridges
Choosing between genuine and compatible options depends on your workspace budget and print volume. Our premium compatible replacements match the physical dimensions and microchip data of original cartridges to track ink levels accurately. Under Australian Consumer Law, using compatible cartridges does not void your printer warranty. This legal protection allows workplaces to manage operating overheads confidently without risking printer support. You can read more about how third-party options perform alongside originals in our genuine vs compatible guide.
Choosing the right cartridge setup
If you print mainly text documents, prioritizing a high-yield black cartridge prevents frequent maintenance interruptions. For workplaces printing multi-page colour reports or marketing materials, purchasing complete value bundles lowers the total investment compared to buying individual colour replacements. If you choose our compatible options to scale down operational expenses, rest assured that they are backed by a comprehensive money-back guarantee should any unexpected performance variance occur. To learn more about our simple return process, please view our full Returns policy. Free delivery applies on all orders over $99 (conditions apply), dispatched quickly from our multi-state fulfillment warehouses across Perth, Brisbane, Sydney, Melbourne, and Adelaide to ensure prompt arrival. To find replacements for other models in this range, explore our complete Brother ink cartridges catalogue.
Pro Tip
When replacing multiple tanks at once, install them one at a time and let the internal printhead alignment cycle finish before opening the access door again, preventing microchip detection errors.
Frequently Asked Questions
Can I use an LC3339XL high-yield cartridge if my printer currently contains a standard LC3337 ink tank?
Yes, LC3339XL high-yield cartridges share the exact physical exterior footprints and clip mechanisms as standard LC3337 versions. They fit into the same internal guide slots, though the high-capacity variants hold a significantly larger volume of ink inside the physical tank.
Why does my colour ink drop when I am mostly printing mono business invoices?
The system routes small microscopic amounts of cyan, magenta, and yellow ink during its automated maintenance and printhead cleaning cycles. This process occurs behind the scenes to keep the micro-nozzles clear of dried sediment and maintain crisp print output.
What happens if I install a mixture of genuine Brother inks and compatible cartridges across the four slots?
The printer reads each slot independently via individual chip contacts, meaning you can successfully run a combination of genuine and compatible cartridges simultaneously without causing alignment errors or system lockouts.
