Just bought an all-metal V6 hotend (pictured), but cannot get it to print before it jams. Printing 1.75mm PLA into a 0.4mm extruder. I have the fan turned on constantly (Indeed, it would not extrude at all without the fan on. My guess is that the cooling fins got too hot and heated the PLA which made it soft and impossible to feed the filament). I was able to have some small success after turning the fan on, and could hand feed filament seemingly without a problem. However, when I bolt the extruder and assembly back together, I cannot get it to extrude for more than a few minutes before it jams. I disassemble it every time, but cannot find a consistent problem. I drill out the old plastic, clean it, and it will work again temporarily. Has anyone else had this issue or experience with this type of extruder? Thinking about going to another extruder with PTFE tube. I have had another extruder hooked up to this assembly and have had consistent extrusion, albeit poor prints (I didn't realize it was a 3mm extruder, and I am using 1.75 filament). Any advice greatly appreciated.