In most printers, the ink or toner does not touch any internal parts of your printer, it only touches the cartridge. As regards your printer warranty, please read the Magnuson-Moss Warranty Improvement Act
United States Code Annotated Title 15 Commerce and Trade Chapter 50 Comsumer Product Warranties 15 Section 2302
(c) No warrantor of a consumer product may condition his written or implied warranty of such product on the consumer's using, in connection with such product, any article or service (other than article or service provided without charge under the terms of the warranty) which is identified by brand, trade or corporate name; except that the prohibition of this subsection may be waived by the commission if: 1. The warrantor satisfies the Commission that the warranted product will function properly only if the article or service so identified is used in connection with the warranted product, and 2. the Commission finds that such a waiver is in the public interest.
What this means to you: The manufacturer of the printer you are using cannot void the warranty on your printer because you use a cartridge or refill kit manufactured by someone other than the printer manufacturer.
In short, NO - our cartridges and refills are guaranteed not to damage your printer.