Not sure what you are referring to exactly.
But contrary to what I thought, you can get refill kits for laser toners.
There are companies who put out ink cartridges that fit the major manufacturers' printers, but they are only a fraction of the cost. (You find them only on the Internet.) Over here, a typical price for a black cartridge by HP, Epson, Canon etc. is about $20 but these other guys sell them for about $7.00. I tried these other replacement cartridges, but I think that may have been what killed my printer. I can't be sure about that, but I am going back to buying the name-brand cartridges again.
I have a Samsung laser printer, cause I have to print a lot of documents for my dissertation works. And it is of course very suitable to print the sheet music, too. I use a refilled toner now after its original toner got empty, and it still works very well (and economic, too).