Gordon says that inkjet ink is obscenely expensive. Leo agrees and it doesn't have to be. That's why printers are so cheap, because they make up for it with ink purchases. Gordon is wondering if it would be worth it to buy inkjet refills. Leo has traditionally avoided refills because the ink usually isn't as good. It also may violate his printer's terms of service, which would void the warranty. Also, some printer cartridges also contain the printer head. Refilling the cartridge won't clean the head and he could end up with more clogs. That's why Leo recommends Laser printers.
Ken wants to refill his ink cartridges, but has heard that there are now chips in printers that prevent you from using it after refilling it with ink. Leo says that it is true. In many printers, you can't use third party cartridges. It's anti competitive, but the printers are so cheap, they make their living on selling the ink. So as long as Ken is refilling the same cartridges and can reset the cartridge chip, it should work. The printer also reads the chip in the cartridge and knows when it's out of ink. So it could be a problem on that end as well.