These heater cartridges heat up very quick, causing Marlin to overshoot the temperature, which can cause failures in your hot end. Start with these PID settings in Marlin: #define DEFAULT_Kp 45.0 #define DEFAULT_Ki 4.2 #define DEFAULT_Kd 120 See http://reprap.org/wiki/G-code#M303:_Run_PID_tuning for tuning
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