The Magnetic Roller's Role in Laser Printer Image Development

Photo by amberman

What is common to both toner cartridges and solar panels? Both require energy to carry out its respective operations and work efficiently. Solar panels need sunshine to store electrical energy into its storage batteries while cartridge units run on electrical energy to sustain the supply of DC voltage bias to its magnetic rollers. In the absence of solar energy, the solar panels will not be able to convey electrical energy into its batteries resulting to insufficient power supply in line with the underutilized energy storage bins. Meanwhile, the toner cartridge will not be able to supply adequate toner powder to form the raster graphic image and bond its particles on the media, to cause uneven toner delivery and consequent defects over printouts. 

Read more »

Disposable Toner Cartridges: Is it ‘Planned Obsolescence’ all the way?

  Photo by kluen

Is the manufacture of disposable toner cartridges classified as ‘Planned Obsolescence’? Most likely! Right from the start, cartridge units are produced with an fixed time line or a serviceable life. This means, that the product easily becomes out of date or obsolete up to a prescribed time – similar in concept to the expiration date for processed foods and medicines. In essence, the production theory behind consumables rests on enticing consumers towards multiple purchases - over a one-time purchase, until the product deteriorates and a replacement becomes mandatory. 

Read more »

How to confirm if your toner cartridge is defective?

 Photo by duchesssa

Ever since desktop printers came into our midst, every little sort of printing trouble seems to have confounded users to no end. A few decades ago, printing was exclusive to local print shops and this prevented end users from experiencing nagging print troubles. But with printing now crossed over to homes and offices, it seems that users never fail to encounter print irregularities in the operation of modern day laser printers. The usual suspect for print defects is of course the toner cartridge, particularly if its a third party unit.

Read more »

Thermal Depolymerization: Can this ease the Toner Cartridge waste crisis?

Even with recycling activities being deployed on all fronts, over 300 million empty and dilapidated toner cartridges still find its way into landfills annually around the globe. So with refuse coming only from printers, the pile of e-garbage has reached S.O.S. (waste crises) proportions. And since toner cartridges are built from materials that will decompose in a thousand years, just imagine how much more of these disposed printer consumables will accumulate from between now and the coming century; before the first bulk of garbage can even start to decompose. Now this garbage problem covers only toner cartridges. What about other plastic based products that are more than the printer’s refuse? Indeed, the compounding waste crisis is staggering.

Read more »

Why Apple Inc. is no longer selling Printers?

Photo by Anders Ljungberg

Why would Apple Inc. abandon the manufacture and distribution of laser printers? It is evident that the consumer electronics giant has placed more interest on other hardware products from its line of Macintosh PCs, the iPod, iPhone and the recently released iPad. But why does Apple Inc. no longer pursue the production of laser printers that would have supported its own line of personal computers?

Read more »

Plug & Print Technology - HP's New Printing Window

Photo by msuvaydas

Is your laser printer consumer friendly? What makes a laser printer a consumer friendly unit? By definition, the term consumer friendly in the world of printers denotes an out of the box printer that hardly poses too much hassle to the user. Now that involves an easy installation and instruction sequence that won't make the head spin. Just like when dining out, diners sit down and heartily eat without undergoing any form of instruction from the dining facility. Without any fuzz at all, the diner simply pays after dining is consummated. This is the basic tenet employed in the design of Hewlett Packard laser printers that has now been integrated into the new Plug and Print Technology. Said technology was developed primarily to to help users follow through what used to be an intricate printing process.

Read more »

Fastest Laser Printer: Can Compatible Toner keep up with its speed?

From its particle size, formulation and fusing temperature, compatible toner has been expertly engineered and laboratory tested to replicate the physical properties of the OEM toner. Moreover, compatible toners undergo the same manufacturing processes guaranteed to deliver basically the same print quality and yield expected from the OEM toner. So how does the third party invention fare with the fastest laser printer in the market today? Can toner refill kits also be used on the cartridges of the IBM Infoprint 4100?

Read more »

SAMSUNG CLP610: Budget Laser Printer Meets Compatible Toner Refill Kit

Color laser printers have ceased to be an equipment for offices and the affluent few. For as little as $300, a unit can already be purchased in the market. Being budget-priced however does not mean low-end because some models priced at this category deliver printouts at fast speeds, lower cost per page (CPP) and even higher duty cycle. This is the void Samsung CLP610nd color laser printer has endeavored to fill. A single pass color laser printer relatively intended for users with modest budgets, the printer promises to be both a performance wizard and cost miser that would help minimize color- printing expenses while delivering unequalled print quality.

Read more »

Does your Printer rate well with the BUZZ METER?

Photo by exian

When it comes to color laser printing, the buzz meter always provides users timely information and feedback on Total Cost of Ownership (TCO), the latest development in print speed based on output pages per minute (PPM), cost per page (CPP), and updates on state of the art printing technology such as the single pass array. The list goes on and on.

Read more »

The "Little Extras" Means A LOT in Color Laser Printing

Photo by wagg66

In our present state where offices rely heavily on electronic communication to transmit data and do business, clutter of office equipment is evident. Office equipment includes fax machines, printers, scanners, PCs and all other mechanisms that add to the physical disarray in an office setting. So in almost all offices, the shift to multi-function printers (MFPs) has become a necessity not only to reduce equipment count and minimize footprint but also to save in the process of procurement as well. A multi-function printer is the all-in-one equipment that serves as the network printer, the document scanner and the fax machine.

Read more »

Brother HL 3040cn Laser Printer: Speed and Connectivity at a Modest Price

Printer manufacturers often highlight the physical design and footprint of the equipment released to the printing market. While aesthetics and space saving features are fine attributes that add value to the investment, this is only good for stand-alone PC and printer configurations as workplaces nowadays require connectivity and just can't rely on printers that would perform haplessly when networked with several other PC and printer peripherals. Not the Brother HL 3040cn LED (Light Emitting Diode) laser printer. The innovative unit peer-to-peer bridges both worlds of aesthetics and sensible network connectivity. When connected via configuration, the printer can be used directly over the network or as a shared printer where printing jobs are first directed towards a central server.

Read more »

Handling Tips for Brand New Toner Cartridges and Toner Refill Kits

Color laser printing is expensive because of the bundled cost of its replacement consumables, particularly the toner cartridge. Therefore, most consumers would really find ways to extend the print capacity of the toner inside the cartridge and get more than the expected yield from the cartridge unit. Many users have turned to toner refills (use of compatible toner refill kits) to replenish the toner supply of an empty toner cartridge and extend its serviceable life. Refilling is undeniably the perfect option, because nobody can deny the fact that toner cartridges are built sensibly to last longer, not just for one print cycle as what printer manufacturers maintain but to as much as 3 print cycles, as recommended.

The initial loading of a brand new toner cartridge into the laser printer is a critical factor and must be dealt with seriously since this will affect the nominal print cycle of the cartridge. Below are some tips to consider to help sustain the cartridge and fully utilize its capacity.

Remove the sealing tape first before loading the cartridge to the printer. The sealing tape is a clear plastic strip of about 1 foot long that prevents toner from leaking when cartridge is not in use or in transit. Be careful not to break the tab which is an extension of the sealing tape and completely pull the strip out from the cartridge. Should in the process the sealing tape breaks and a portion of it is left inside the cartridge, then it only means that the cartridge is defective and should therefore be returned to the manufacturer.

Most toner cartridges have a print capacity of around 3,000 pages (based on the industry average of 5% coverage) when properly handled and cared for. Thus when left for some time before installation, the cartridge unit must be stored in a cool, dry place and possibly inside its original packaging. New cartridges are sealed in aluminum foil wrappers that protect toner from exposure to sunlight; while moisture proof to prevent humidity from seeping into toner particles.

Likewise observe the above storage tips when dealing with replacement toner, particularly one supplied with the toner refill kit, to avoid the manifest of print quality defects and the turnout of lower yields. When the printer prompts ‘toner out’, immediately administer toner refills and never allow the cartridge to print on an empty toner chamber because doing so will damage the sensitive imaging component and shorten the effective lifecycle of the cartridge.

Printing Cost Per Page (CPP): Dissecting a Print Job's CPP

What constitutes CPP?
Reckoning the cost per page (CPP) of laser print jobs is not an easy task as there are a number of variables involved in the computation. It would have been easier if CPP is measured only based on consumable costs (e.g., toner cartridge, toner refill kit) against the number of pages printed. But then this is not the case since the cost of paper is also factored in along with the energy consumed to process the print job. Perhaps, what is most daunting is determining the depreciation cost of the printer unit as printer components like the OPC Drum and fuser do not expire at the same time. Each time you print, these components also share some degree of wear and its life cycle is dependent upon the number of pages printed. If the rated capacity of the OPC drum is 6,000 pages (an assumption) then CPP for the OPC drum is cost of component divided by the number of pages printed. Therefore, one will have to rely on calculated assumptions to get a fair cost analysis of these consumables.

Is the standard Page Coverage of 5% realistic?
Take the case of the HP CB540A black toner cartridge that loads the HP LaserJet CP1215 color laser printer. With the consumable's rated capacity of 2,200 pages at 5% coverage, the standard page coverage of 5% is too conservative against the actual coverage. Most likely, coverage borders between 30% to 35% which brings actual yield in printed pages to only around 1,400. So, if the print job is over 2000 copies, then in-house printing will be more expensive considering the need for another replacement cartridge to produce the remaining copies. In this case, it becomes more economical to outsource the print job. On the other hand, if the print job only involves 20 to 30 pages, then in-house printing using the CP1215 laser printer is really the most sensible option.

HP Laser Printer CPP versus offset printer charge per copy?
To help laser printer users appreciate the value of CPP, printing giant Hewlett Packard prepared a printing cost footprint - a cost computation that covers all the variables relevant to the print out of a single color document.by the CP1215 color laser printer. HP’s computation of cost per page (CPP) include toner requirements, cost of paper, energy required to sustain printer operation as well as the depreciation of printer components. HP’s cost computation for a color print job that covers 50 copies at 30% page coverage comes at $0.295 per page; with the print job's aggregate cost estimated at around $14.72. The acquisition cost of the color printer is valued at around $300 - so it will take 17 print jobs of the same volume to offset the cost of the printer. The CPP is definitely much cheaper in this case compared to the local printer's $0.66 charge per copy for the same print requirement.

For users intending to reduce on printing expenses, CPP is even lower with a compatible toner refill kit - cheaper by 50% than OEM toner cartridges. Toner refill kits are produced by third party manufacturers and are intended to refill empty OEM toner cartridges. The CB540A cartridge is retailed at $75 while an equivalent toner refill kit sells for only $39.95. Nonetheless, the consumable delivers similar print quality and yield as the OEM toner cartridge. Read more about toner refill kits from this post.

Xerox Green World Alliance - Where Used Xerox Toner Cartridges Should End Up!

Xerox not only gave the world a glimpse of the first laser printer, but also invoked socio-environmental responsibility through its recycling program called the Xerox Green World Alliance. Decades after the first laser printer came out, tons and tons of empty toner cartridges have now found its way into landfills; excreting leachage that contaminates underground water and waterways. Moreover, the volume of greenhouses gases pumped into the atmosphere through its production should not be discounted. Laser printers may have helped us accomplish our printing needs, but it has also left a trail of e-garbage that could decompose in 450 years if unattended in dumpsites.

The Xerox Green World Alliance is one such program launched by Xerox that aims to help conserve our rapidly vanishing reserves and likewise limit the influx of environmental pollutants by recycling empty OEM toner cartridges. In the United States alone, over 110 million toner cartridges are disposed annually.If piled vertically, its height and bulk could equal the 110 floors Sears Tower. Consequently, around $15 billion is required to manufacture these cartridges - that is by the way, 10 times the construction cost of the Sears Tower.

How does the Xerox Green World Alliance operate its recycling program? Xerox Corporation inked a partnership with logistics giant UPS. Through the transport facilities of UPS, empty toner cartridges accumulated in UPS pickup points are fetched and ferried to the recycling plants of Xerox Corporation. The process relevant to individual cartridge returns is itemized as follows:

1. Consumers who wish to avail of the Xerox Recycling program can log on to Xerox's website and print pre-paid UPS shipping labels that are uniquely bar-coded (maximum of 15 at a time) for each pack intended for return.
2. Pack the used toner cartridge using the same packaging or carton from which the item came in and affix the shipping label - one label for each package. Each printed label contains a foolproof tracking number and bar code. Use of photocopied or reproduced shipping label is not advised.
3. Hand in your packed item to the UPS representative once your new consumable purchase is delivered. Individual returns can also be dropped off at UPS pick-up points or outlets. Pick up is encouraged by calling1-800-PICK-UPS (742-5877) or transacting online at www.ups.com - indicating the package as an ‘ARS Return Shipment.’

Xerox now makes recycling more convenient to its consumers through in-house recycling services that drastically cuts down office and household printing waste and in the process help save the environment.


We should not always rely on Xerox Corporation for the recycling of unused toner cartridges. Do-it-yourself projects such as refilling empty toner cartridges with compatible toner refill kits is a simple act of recycling that is of tremendous help to global conservation efforts.

Printout Defects - How to determine if the toner cartridge needs to be replaced?

Too much hype has been accorded laser printers lately, with features involving state of the art technology that is intended to produce the best possible printout. But then again, all electronic based devices and applications packed into the laser printer are designed to ease the transfer of paper from one printer component to the next and likewise help users diagnose errors even without opening the unit. However when one assesses the laser printer, one fact remains unchanged - it (laser printer) is still a mechanical beast composed of rollers, starting from the paper pick-up tray to the OPC Drum till the paper exits as a printout.

Since paper comes in contact with all these rollers, pertinent print defects that materialize over the printout can help detect if one of the rollers is in fact worn out or defective. Rollers in a laser printer come in a variety of sizes to therefore leave a trail on the printout - in the form of print irregularities. And the defective roller can be detected by simply measuring the distance between print defects. A damaged OPC Drum for instance will produce print irregularities commensurate to the circumference of the drum. Therefore, the bigger the diameter of the roller, the greater the distance between defects can be expected.

A defective toner cartridge can be diagnosed when defects on printouts appear at regular intervals at particular distances of say 32mm, 37.7mm, and 76.3mm between defects. This would indicate that the roller inside the toner cartridge is already defective and requires immediate replacement. In this case, no amount of toner refills - even from quality toner refill kits, could resolve the print issue. This condition becomes highly likely following the third refill of an empty toner cartridge because by then, cartridge parts may have worn out as the cartridge unit reaches the end of its serviceable life.

An empty toner cartridge meanwhile will not produce repetitive print irregularities but instead generate faded printouts. When met with this scenario, the user should be elated over the fact that the cartridge is still in fine form and therefore requires only a new shot of toner; that is quality refill toner powder from a reliable toner refill kit – in order to print again.

A laser printer user need not be an expert to determine when the toner cartridge requires replacement. Studying the trail of defects that materialize over the printout would show the irreparable condition of the cartridge unit.

Go Green with Toner Refill Kits!

Toner refill kit manufacturers have only one aim in mind – to help countless laser printer users cope with the burgeoning office and household printing costs. Through the years, third party manufacturers envisioned how the business of refilling empty toner cartridges could directly help the environment by reducing in part the over 1million pounds of trash pumped into dumpsites and landfills annually while conserving as much as 2 million quartz of oil. Know that around 3.5 quartz of oil is required to manufacture a single cartridge. Ridding the earth of its e-garbage trash is a gargantuan task that requires personal commitment and the collective efforts of electronic equipment and accessories users.

The world's annual e-garbage volume - if it can be literally converted into cubes; then the pile of trash would likely equal the height of the now defunct WTC twin towers; but then still taller by over 110 floors. Now consider the $150 million development cost for the twin towers and that amount is only about 10% of the total annual expenditure for toner cartridges. In effect, if we patronize refills for empty OEM toner cartridges, we not only help the environment and collaborate with global conservation efforts; but also generate savings of as much as 80% over the cost of OEM retail cartridges.

The most effective method of recycling empty OEM toner cartridges is still through the use of a compatible toner refill kit. Just a single refill effort on an empty cartridge will nominally help reduce the pile of e-garbage to as much as 35% on the amount of trash dumped into our ever shrinking global garbage disposal facility. Note that over 110 million toner cartridges are dumped annually on the average. Consequently, a 35% reduction in e-garbage disposal would likely result to a summary reduction in the manufacture of cartridges (of the same rate) as well.

As Americans it becomes our social duty to lead others and show our concern for the environment. Let us not leave a legacy of uncontrolled trash to the generations after us. Recycle now and reload empty toner cartridges with toner refill kits!

New LTS Kit: HL-2400 Toner Refill Kit

If your laser printer is the Brother HL 2400 or one of the models coming from the HL series then we've got good news for you. You probably have a number of empty TN01 toner cartridges dusting in storage right now but don't just throw them out yet! LTS just released a new refill toner product that is intended to replenish the toner supply of TN01BK, TN01C, TN01M and TN01Y cartridges loading the HL-2400 laser printer. Available in 4 Packs, the Brother HL 2400 toner refill kit comes supplied with 4 bottles of refill toner; each bottle containing toner powder that is 100% compatible with the black, cyan, magenta and yellow toner cartridge respectively.



Print Performance
Engineered to match the physical composition and technical specifications of the OEM TN01 toner, the HL 2400 compatible toner has therefore been designed to duplicate - if not exceed; the print quality of copies produced using OEM TN01 toner cartridges. Therefore with the Brother HL 2400 toner refill kit, consumers are guaranteed of crisp, razor sharp prints and yield of up to 6000 pages at 5% coverage; much like what genuine cartridge can deliver.

Cost Comparison
The Brother HL 2400 laser printer can be acquired for only $450 or even less if you factor in sales discounts. Consequently, the prevailing retail price of its replacement toner cartridges ranges from $100 to $160 a piece (with color cartridges priced higher than the monochrome cartridge). The purchase of a rainbow kit or bundle of 4 cartridges should therefore easily exceed the acquisition cost of the laser printer so that buying a new printer unit every time it runs out of toner becomes a more sensible option. Well, not with the HL 2400 toner refill kit! Selling for only $100, the 4 pack bundle will definitely help reduce your periodic expenditures on printer consumables and likewise ease out the high costs of laser printing.

Follow the refill process precisely as illustrated in the accompanying instruction manual to successfully transfer refill toner powder into the hopper while avoiding contact with toner particles in the process (in case of toner spills). The HL 2400 toner refill kit also contains materials and tools useful to the refill process like the funnel cap, chemically treated toner wipes and latex gloves.

Color laser printing is really expensive, but with good and reliable information, a user can cut printing costs by as much as 85% through the use of quality toner refill kits.

Defective Toner Cartridges: The Primary Source of Imaging Problems

Ask any long time laser printer user about imaging problems and pointblank the answer will most likely be associated with defective toner cartridges. Typical imaging defects could range from the printout of blank pages, solid black lines, streaks, double images, toner specks, lines, light and dark prints over the surface of the printed page; to blurred images and even toner flaking or rubbing off. Said defects could also be attributed to low quality toner (particularly coming from run of the mill manufacturers of toner refill kits) or caused by a defective fuser assembly that could not deliver sufficient heat to support the proper fusing of toner particles to paper. But then again in most cases, a defective toner cartridge is suspect.



Defective toner cartridges are usually linked to third party manufacturers with OEMs believing that their stringent production methods could actually foolproof cartridges from any defects and other related troubles. On the contrary, OEM cartridges are subject to a defect margin and the chances of purchasing a defective, OEM cartridge is probable. OEM cartridges have a print defect margin of 2% while compatible cartridges have it twice over at 4 to 5 percent.

Low quality toner is another source of print defects. As expected, this defect is attributed mostly to compatibles; particularly those produced by fly by night manufacturers. OEMs devise particular toner formulas that fit the requirements of a printer type or model in terms of resolution and speed. Moreover, OEM toner was manufactured under strict quality standards and laboratory tested to meet ASTM International guidelines. But that doesn't mean that third party manufacturers cannot produce level quality toners. In fact, manufacturers from the aftermarket use the same set of product standards; from substance formulation to grain size and even melting point so that it becomes possible for refill toner and compatible toner cartridges to match or even exceed the performance of the OEM toner in terms of print quality and yield.

Improper storage practices for toner cartridges could also trigger print defects - even for OEM cartridges. OEM cartridges are packed in sealed, moisture proof bags that normally have a shelf life of about 18 to 24 months. Toner cartridges succumb easily to temperature changes and humidity; thus, resulting to the damage of its moving mechanical parts or the photosensitivity and electrostatic properties of toner particles. Thus, cartridges ought to be stored in a cool and damp-proof environment or better kept inside its bag when not loaded to the printer.

Toner cartridges should therefore be handled delicately and stored in a correct environment to protect it from damage that could lead to irregular defects in the printout.

__________________________________________________________________

To produce decent laser prints and yield at a reasonable price, refill OEM toner cartridges with toner refill kits. The toner refill kit line of Laser Tek Services is cheaper by as much as 80% than the prevailing retail price of OEM toner cartridges.

HP 2600n Laser Printer: When Print Defects are Caused by Low Toner Supply

The HP Laserjet 2600n laser printer is a workhorse color printer unit set in a small package. From its exterior, the outside casing is aesthetically envisioned while the control panel is so easy to operate. Moreover, running inside the unit are solid mechanical parts that run in synch and electronic devices that operate smoothly to thus make this Hewlett Packard invention well-suited to the preferences of a discriminating consumer. But like all laser printers, the HP 2600n produces its own share of flaws over printouts that are generally triggered by the condition of pertinent parts and the state of consumables.

What would be of interest to users of compatible toner are print defects caused by low toner supply. Know that the printer's supply gauge will not display information about the supply level of consumables when non-HP peripherals such as third party toner cartridges and refill toners are loaded into the printer and with empty toner cartridges respectively. So how would the user know if print defects are being caused by low toner supply when toner refill kit - replenished cartridges are used. Find below a rundown of typical print defects which can be possibly attributed to a missing cartridge, questionable toner cartridge, cartridges that are incorrectly loaded and of course the low toner supply of third party consumables.

1. If one of the color (CYMK) cartridges is producing inconsistent prints even after a new cartridge has been loaded into the printer.
2. One or more colors are not printing or inaccurately printing even when all of the cartridges loaded are new. In that case, the problem could have been caused by a sealing tape on one of the cartridges that has not been removed.
3. The presence of print marks that repeatedly appear at even intervals on the same printed side of the page.
4. The amount of background toner shading is beyond tolerable limits and is no longer acceptable.
5. A series of vertical bands or streaks appear regularly on the printed page.
6. Print results are light and faded.

The abovementioned print defects are indications of a defective toner cartridge which requires immediate replacement or could possibly be caused by a cartridge that is already low on toner supply. In instances where a refilled cartridge is loaded into the printer, a manual assessment of the responsible cartridge is necessary since the supply gauge is not available to monitor supply levels.

Bear in mind that the HP 2600n color laser printer uses 4 toner cartridges (CYMK) to print and replacing the bundled cartridges is already worth a fortune; at times even exceeding the cost of the laser printer. Big thanks to the HP 2600 toner refill kit because the bundled cost of replacement toner is cheaper by as much as 90% off the price of OEM color toner cartridges, and the user gets similar print quality and yield to the original toner.

How to determine if the laser printer drum needs to be replaced?

The photoreceptor drum can be considered as the most important component of laser printer units. Its critical function involves the receipt of text and images from the laser scanning assembly and transferring the same to paper to produce the final print. Considering its functionality, the printer drum needs to be replaced periodically to continuously achieve commendable prints. There are a number of indicators that should inform the user whenever the laser printer drum is due for replacement, as follows:

Computer prompts the user. There are only a few printers; particularly colored laser printers, that alert users when the drum needs to be replaced. Usually, the alarm sets off in the form of a flashing message that materializes on the monitor. How convenient for users who operate these types of laser printers. Now they only have to wait for the warning message to set off.

Unclear or blurry printouts. At times, users will come across printouts that are unreadable while having streak marks over the surface of the printed page. This could be a sign that the drum is damaged and needs immediate replacement.

Presence of black spots on printed document. Unwanted marks over the printed page such as black spots indicate that the drum is defective and can no longer be used. This being the case, the user should purchase a replacement drum to be able to resume print jobs.

Light or faded text and images. A noticeable change in print out quality such as faded prints could imply that the drum is nearing the end of its serviceable life or that it is slightly damaged and needs replacing.

Blank printout. Laser printer drums have specified life spans based on the number of printed pages. Thus, when a blank printout is produced, this could only mean that the drum has reached its set lifespan and is due for replacement.

Keen observation is the key to knowing when the laser printer drum needs replacement. Note the abovementioned indicators and have a ready compatible drum replacement on hand to avoid print delays and continuously achieve quality prints.

__________________________________________________________________

To produce decent laser prints and yield at a reasonable price, refill OEM toner cartridges with toner refill kits. The toner refill kit line of Laser Tek Services is cheaper by as much as 80% than the prevailing retail price of OEM toner cartridges.