I have a Brother MFC-L3770CDW and it was the first time I had to buy a new toner for it. I didn't want to pay the $400 that Brother wanted for their cartridges as that's more than I paid for the printer. I've searched a lot trying to find non-brand parts that still work and won't be rejected by the printer. I've given them a try and I'm happy to report that they work great. The whole process of replacing the toner cartridge took about 2 minutes and was immediately accepted by my printer. I printed a test page and everything looks fine. Very satisfied.
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