Samsung ML-1665 Series chip

Also for: ML-1660 / SCX-3200 / SCX-3217

Our ML-1665 starter kit explains when and to use this chip. (The starter kit also includes a chip).

Generally speaking, a chip is needed to enable the use of every refill bottle.
That said, it isn't quite the whole truth. There's a hack that arises after a few refills, which is explained in our ML-1665 starter kit.