Which toner fits the Canon i-SENSYS MF645Cx?

What Canon's suffixes announce

Five machines share the 054 cartridge, and their names differ by only a few letters. Those letters change nothing about the consumable, but they predict rather well how fast it will go:

• C — the machine is colour;
• w — it has Wi-Fi;
• d — it prints with automatic duplex;
• x — it is fully equipped: document feeder, fax, touchscreen.

An LBP621Cw is a plain printer standing on a desk: it uses only what is sent to it. An MF645Cx, with its feeder and its fax, copies in batches and receives faxes that print on their own. At comparable office activity, it will empty its 054 cartridges noticeably faster — for exactly the same cartridge.

That is useful when ordering: do not model your resupply pace on that of a colleague with the same machine "give or take a letter".

1,200 pages per colour: plan for a set

The yields in this series are modest — 1,500 pages in black, 1,200 per colour. On a machine used by several people that goes quickly, and the 054H nearly doubles the autonomy of the black, the cartridge that always runs out first.

For the colours, keep a full set in reserve rather than an isolated cartridge: on a colour laser, a colour document draws on all three shades at once, so they reach the end of their life within days of each other. That holds for the whole colour i-SENSYS range, including more recent series such as the MF657Cdw with its 067 cartridge.

What the fax uses without being asked

The "x" brings the fax, and with it a consumption no user has decided on: an incoming fax prints on its own, advertising included. The panel allows reception to memory to be turned on, which keeps documents until you choose to print them. On a machine that receives regularly, that is several hundred pages saved a year.