Print as much as you can for 6 months at 290C or less. If it “melts, coupler squeeze” before this time we replace it. That is how confident we are! No charge, no outbound shipping . If it is only physically worn on its inside, we replace it with a 50% discount. I2K is never replaced. Works with ALL filaments known to us as of October 19th 2016. Orders taken now, this product will sell out in periods. Consists of I2K wafer chip & TFT255C in combination.