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Cartridge Comparison Guide
  • Cartridge Types
  • Ink & Toner Basics
  • Number of Pages & Shelf Life
Cartridge Type
Genuine or OEM (Original) Cartridges Remanufactured Cartridges Compatible Cartridges
Description OEM stands for original equipment manufacturer, meaning the cartridge was made by the same company that made your printer. Original brand cartridges are very reliable and sometimes the only option if your printer is new to market or uncommon. Remanufactured ink is a genuine brand cartridge that has gone through one cycle of use. After use, the cartridge is recycled, acquired by a remanufacturing facility and put through a rigorous professional refurbishing process. During the refurbishing process the cartridge is disassembled, thoroughly cleaned and tested for quality. It's then carefully refilled, tested again and brought back to life. Buying remanufactured prevents one less cartridge from ending up in a landfill. A compatible cartridge is a brand new ink cartridge built by a manufacturer other than your printer. It's like buying the generic version of the genuine brand. Most are uniquely designed to differentiate from genuine cartridges. Despite any structural difference you may notice, the cartridge will still fit in your machine and print a full yield, just like the original brand.
Price Factors Many printer manufacturers follow the razor-and-blades business model which may result in higher priced genuine cartridges. Remanufactured ink is much cheaper than the original brand ink. It's far more cost effective to refurbish a previously used cartridge than create a new OEM from scratch. Compatible ink is much cheaper than the original brand. Compatible suppliers don't have to worry about the additional costs that hinder OEMs like new printers or firmware, which lets them keep prices low.
Quality Original cartridges work extremely well and are covered under a warranty by the printer manufacturer High quality remanufactured ink will match the quality of the original, but not all remanufactured ink is created equal. Make sure you buy from a reputable supplier in order to get the absolute best results. High quality compatible ink will match the quality of the original, but not all compatible ink is created equal. Make sure you buy from a reputable supplier in order to get the absolute best results.
What's the difference between ink and toner cartridges?
Ink Cartridges Toner Cartridges
Printer Type Work with inkjet printers Work with laser printers
Material Liquid ink Dry powder
How it works Inkjet printers use a series of nozzles that spray tiny drops of ink directly on the print suface Laser toner printers use static electricity and heat to bond dry toner powder to a page
Commonly used by Casual home users, small business and photographers Large businesses and schools
Number of Pages You Can Print A cartridge's page yield is the estimated number of pages you can print. Page yield is based on 5% page coverage. This means that the quoted page yield is based upon printed pages where only 5% of the page has been imprinted with ink. For example, a short memo has approximately 5% coverage. If you have a cartridge that has a yield of 500 pages, it can print 500 pages of that short memo. If you are printing letters, photos or graphics, your coverage will vary greatly and your page yield will drop significantly.
Cartridge Warranty and Shelf Life Most ink and toner cartridges include a warranty or "best by" date on their box. Remanufactured and compatible ink cartridges can last 12-18 months unopened, and toner cartridges can last up to 3 years.
Cartridge Care and Storage Only open a cartridge when you need it. Opened cartridges will eventually dry out, especially if the protective tape or clip has been removed. If you have an open ink cartridge around and would like to try and prevent it from drying out, place it nozzle side up in a plastic airtight tub. If your cartridge came with protective tape or a clip reapply both before storing. Place a damp cloth or paper towel in the tub, next to the cartridge and keep it stored in a cool, dark place.

Compatible Toner for Samsung SCX-4321/4521, SCX-4521D3 Black (3,000 Pages)

Reg. Price $79.99

Our Price $34.99

In stock

Buy 3 or More Black for $31.99 each (save $9.00+)
  • Compatible Printers

  • Description / Specifications

  • Q&A and Reviews

Choose your printer below for a full list of products
Samsung - SCX Printers

Description offers compatible laser cartridges to replace the Samsung SCX-4521D3 black toner cartridge exclusively designed for your Samsung SCX-4521 or SCX-4321 printer. Our laser toner cartridges are built entirely from new parts, and are of the highest caliber. Our LD brand compatible laser cartridges are backed by a 2 Year Guarantee and ship fast!


SCX-4521D3 Toner Cartridge Samsung Samsung SCX-4521D3 Black Standard Yield 3000 1.17 cents 24-36 Months
*Average cartridge page yield in accordance with ISO IEC 24711

Yes , I will buy this item again


very fair price , very long lasting cartridges , excellent quality



Excellent Product


Ordered 3 black toner cartridges. Received in 2 days and free shipping. Tested them. All printed dark black. Did not smudge. Will uses them again.


Cleveland, OH


Neither cartridge worked


: I just received 2 toner cartridges for my Samsung SCX-4521F. I have tried both cartridges and I keep getting the error "No Cartridge" when the copier warms up. I put the old one back in and it works fine. It looks like the fuse on the left side of the cartridge is not lining up to the contact in the copier.

CPA in a hurry

Lakeville, MN




Would it be possible you may have sent me an empty cartridge? My printer is showing signs of an empty cartridge like the one I replaced.


Crossville, Tn.

Great Product excellent Service


I am on my fourth Laser Cartridge over the past 18 months and I have found the LD Product to meet the life expectancy and quality of the original manufactures product. Service and promptness of delivery have been excellent. I had one occasion to test the 100% Guarantee, and it was exactly as stated. My problem was addressed immediately in a professional and courteous manner. A 5 Star Company.




Satisfied and Returning Customer


Quality, price and delivery have been excellent. The toners are working well so far and have been a great savings. Would recommend.




Very compatible to original companent.


Escleent product at a great price to origianl equpment. Last as long as the original and in the quality of printing color. A repeat customer and will be again




Flawless substitute


LD laser cartridges have worked flawlessly in 2 Samsung printers; I keep ordering from them since they are about 30% cheaper than the name brand cartridges.


Austin TX


Samsung toner cartridge


I have received the product on time but I have not opened yet for use. From my past experience the product would be a quality. Thanks.




You can't go wrong with this.


This company is great. I haven't seen a better price anywhere and the quality of the product is excellent.


New Jersey



4.2 21


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