Uni-Kit has a new refill kit available for filling the Samsung MLT-D101 cartridge. These cartridges require a new chip before they can be recognized by the printer as "full". Furthermore, the Uni-Kit replacement chips work only with a specific firmware - you need to download the specific firmware before installing the chips (see instructions with chips).
These refills work in the following printers as of June 1, 2012 (newer printers may be released that accept the D101S cartridge which are expected to work with the same chip as long as firmware is downloaded per the chip instructions):
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Samsung ML-2160
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Samsung ML-2165W
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Samsung SCX-3405
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Samsung SCX-3405FW
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Samsung SCX-3405W
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Samsung SF-760P