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soundy, you should never say all toners are the same inside.
I went to an Asian aftermarket toner refill shop before, the guy showed me there are no less than 10 types of toners with different spec in his "refill room". Of course, I can't tell the different when my naked eyes, they all look the same, but he warned me wrong toner will fuck up the fuser and all the rollers.
For Epson alone, he has 4 different types of toners.
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