It’s been a while since we’ve reviewed an OKI Data stand-alone (that is, print-only) color printer. The most recent was the wide-format-capable OKI C831n back in March of 2014. Like the subject of our review here today, this was also a laser-class printer.
We call these machines “laser-class” because, though they look and act like laser printers, they use light-emitting-diode (LED) arrays, rather than actual lasers, to etch page images onto the printer drum, which the toner in turn adheres to. It’s a small technical distinction, but we make it because in places, printers like these are referred to by their proper name: LED printers. Today’s review subject, the $789-list OKI C612n, is indeed an LED-based machine.
For a while there, most of the major laser-printer manufacturers—Dell (really Samsung, behind the scenes), HP, OKI, Canon, Brother—deployed LEDs in some of their laser-class machines. Why? Because LED arrays are cheaper to manufacture, and they’re smaller, allowing printer makers to make less-expensive, smaller, and lighter machines. Nowadays, we don’t see as many LED-based printers as we once did, but OKI still deploys them in a significant portion of its product line.
In addition to being less costly and smaller (since they have fewer moving parts), LED arrays can also be more reliable than their laser counterparts. On the other hand, laser-based mechanisms are typically more precise; they have only one light source, so every pixel gets the same amount of illumination, making for a higher degree of consistency. LED arrays have thousands of LEDs, and, as a result, illumination can and does vary among them. In addition, the number of LEDs in an array determines the printer’s resolution, where most laser printers support more than one dots-per-inch setting.
Does this mean that laser output is inherently superior to LED prints? It’s not that simple. Let’s say that it can be, depending on the consistency of the LEDs across the array, and to an extent that can depend on how well it’s built. What we will say is that we’ve seen some LED-array-based printers, such as the OKI C831n mentioned above, that churn out some darn good-looking prints. So, like in so many things in life, the answer to our question is: It depends.
Which brings us back to the OKI C612dn. Currently, OKI offers two C612-series machines: the model we’re reviewing, the OKI C612dn, and the $649-list OKI C612n. The “d” stands for “duplex,” or automatic two-sided printing. In other words, to get auto-duplexing from a C612 model, you’ll have to fork out an additional $140 (or thereabouts, depending on the street prices of the printers that day). Apart from the duplexing distinction, these two printers are essentially the same.
Compared to some laser printers reviewed recently, such as the $999-list Dell Color Smart Printer S5840Cdn and the $800-MSRP HP LaserJet Enterprise M553dn, the OKI C612dn’s output is slightly subpar. And compared to that pricier Dell competitor, the running costs (the per-page cost of toner) is a little high. (For a detailed description of print quality, see the Output Quality section near the end of this review; for running costs, refer to the Cost Per Page section.) On the other hand, another benefit (aside from smaller machines) of LED-based printers is that they use significantly less power than their laser-based counterparts.
That said, whether the OKI C612dn is right for you really depends on what you’re looking for. The truth is that we’d feel much better about recommending this OKI model were its running costs a little lower. If you print thousands of pages each month, a fraction of a cent for each page can make a big difference in the ongoing cost of ownership. Other than that issue, though, the OKI C612dn is a highly capable laser printer with better-than-passable output for most business scenarios.