Sintron] 3D Printer MK8 Extruder hotend 0.4mm Nozzle Latest Upgrade Print Head for 3D Printer Reprap Mendel MakerBot, Prusa i3 & rework (3D-MK8) (1)We have made necessary design to prevent "jammed" problem. (2)The extrude is with thermistor sensor. (3)Compatible with ABS and PLA 1.75mm. (4)We not just sell them, we also provide good after-sales service, so welcome to discuss with us, we will try to do technical support as much as we can.