Samsung ML-3310ND Series compatible chip
For use in: ML-3310ND / ML-3710ND
In our experience - 11,416 test prints and 5 actual refills done - a chip was necessary
in order to use the refilled cartridge.
So unless you're confident you've got a work-around, you'll need a chip to go with every bottle of toner.
Our Samsung ML-3310ND starter kit shows how to change the chip (and also includes one).