First off, I assume you've told LD what printer model you have. They should know whether or not their toner cartridges will work in that printer model. If they insist that they do, you may have a problem with your printer configuration.
It may actually be illegal for a printer manufacturer to force their toner cartridges on you. The Supreme Court ruled last year in Impression Products v. Lexmark that a patent holder cannot use the patent to protect a product after it has been sold. In that case, Lexmark argued that Impression Products was violating its patent by refilling toner cartridges and attaching a microchip so they would work in Lexmark printers. SCOTUS basically said no, sorry, after the sale your patent is exhausted as far as the customer's use of the product is concerned.
That doesn't mean that manufacturers can't devise other ways of forcing you to use their consumables - they just can't rely on their patent. Whether it's worth the effort to try anymore is questionable. The good news is that the guys at the third-party vendors are just as smart as the guys at the manufacturer, so any new scheme will quickly be decoded. If, in fact, the printer you bought has a new chip that LD can't replicate now, they will be able to do so soon.
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