Here is a company explaining
how you can you can use aftermarket cartridges.
they and many others cite the Magnusson_Moss Warranty act
a manufacturer may not require the use of any brand of ink (or any other article) unless the manufacturer provides the item free of charge under the terms of the warranty
understanding Moss Magnusson Warranty act
for those too lazy to read this the quote from the FTC's web site
""""Tie-In Sales" Provisions
Generally, tie-in sales provisions are not allowed. Such a provision would require a purchaser of the warranted product to buy an item or service from a particular company to use with the warranted product in order to be eligible to receive a remedy under the warranty. The following are examples of prohibited tie-in sales provisions.
In order to keep your new Plenum Brand Vacuum Cleaner warranty in effect, you must use genuine Plenum Brand Filter Bags. Failure to have scheduled maintenance performed, at your expense, by the Great American Maintenance Company, Inc., voids this warranty.
While you cannot use a tie-in sales provision, your warranty need not cover use of replacement parts, repairs, or maintenance that is inappropriate for your product. The following is an example of a permissible provision that excludes coverage of such things.""""
nnnnnnnnnnnnnnnnnnnnnnnnn...damn sticking keyboard