Reddit reviews Anycubic Barrel Stainless Steel 30mmM6 Nozzle Throat with PTFE Tube for MK8 Tube Makerbot 3D Printer Extruder Hot End
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Material: Stainless steelSize: 30mm*M6Compatible with MK8 extruderPack of 5 PCSWith PTFE liner inside
https://www.amazon.com/gp/aw/d/B0188G39MI/ref=mp_s_a_1_1?ie=UTF8&qid=1482889760&sr=8-1&pi=SY200_QL40&keywords=barrel+anycubic+throat&dpPl=1&dpID=41VkGDntWAL&ref=plSrch
Grab these and keep printing.
I recently had this problem. I used a heat gun on the tube to warm it up and get it out. However if your not VERY careful you melt the liner as well. You can order replacements from amazon
That is not a spring. It is the heatbreak similar to this one https://www.amazon.com/dp/B0188G39MI
It is not the original heatbreak but that is what it is