Frequently Asked Questions

Will our ML-4050 really get 20,000 pages out of one cartridge?

That depends on what the pages carry. The ML-D4550B's 20,000-page rating is measured at roughly 5% coverage — ordinary letters, invoices and reports. An ML-4050 printing that kind of work should finish near the figure. Pages with charts, logos or shaded tables lay down more toner and will pull the total down; that is coverage doing the talking, not a short-filled cartridge.

How does the cost break down?

The cartridge is $106.57, and spread over its rated yield that is about 0.53 cents of toner per page. Cartridges in this class are bought on that arithmetic rather than the headline price: divide any offer by its rated pages and the comparison makes itself.

Which machines take this supply?

This is the listed cartridge for the ML-4050, and the same unit also serves the ML-4050N, ML-4550, ML-4551N and ML-4551ND. If the cartridge that came out of your machine is stamped ML-D4550B, this is its replacement — the code on the cartridge settles the question.

Our output has gone pale in patches — is the cartridge finished?

Possibly, but check the pattern first. Even fading across the whole page usually means the toner is nearly spent; sharp repeating marks at regular intervals point elsewhere. On a cartridge rated for 20,000 pages it is worth glancing at the machine's page counter before ordering — a mid-life unit showing faults is a warranty conversation, not a reorder.

Is there a larger option than this?

No — the ML-D4550B is already the high-yield member of this family. Its standard-yield sibling, the ML-D4550A, carries a smaller fill for the same printers; this B cartridge is the one bought when the aim is the longest gap between changes.

What happens if the cartridge disappoints us?

It is covered by a one-year warranty, and returns are free throughout the first year — the details are set out on the shipping and returns page. Questions are answered by our support team Monday to Friday, 9 AM to 5 PM CST.

About This ML-4050 (ML-D4550B) Cartridge

The compatible ML-D4550B listed for the ML-4050: 20,000 rated pages in a single combined toner-and-imaging unit, $106.57, about 0.53 cents a page. The same cartridge also fits the ML-4050N, ML-4550, ML-4551N and ML-4551ND. It ships from the nearest of our warehouses in Illinois, Pennsylvania, Georgia and California, and further supplies for the platform are gathered under Samsung toner cartridges.