I've read through the the troubleshooting guides and double checked everything. I keep getting solidified nylon in the heat break that I have to drill out. =( Generally speaking it prints for a little over an hour before getting jammed up. I've also submitted a support form - but I wanted to provide some more info here. Here are all the details: hot end: e3d v6 1.75mm bowden hot end with e3d 0.8mm nozzle printer: SeeMeCNC Rostock Max v2 Cooling - Using included fan and duct hooked up to hot end's 12v power supply - No heated chamber - No obstruction - Heatsink does not feel warm to the touch at 240c Bad Filament - using Taulman Bridge - ~1.77mm diameter. don't think thats the issue Configuration - confirmed that EXT0_TEMPSENSOR_TYPE is 8 - I've run PID autotune PTFR Tubing - confirmed tubing is pushed all of the way down Slicer - Cura 14.07 on windows. - Nozzle correctly configured - Retraction is 100mm/s and 1.5mm distance - 0.5mm layer height - 30mm/s print speed - 240c hot end, 55c bed temp - 200mm/s travel speed Extruder - EZStruder from SeeMeCNC - http://seemecnc.com/collections/parts-a ... ld-end-kit *** Things I've tried: - Reducing the printing temperature from 255 to 240c for Taulman bridge. That seems to have helped. - Dropped retraction from 5.4mm (oops) to 1.5mm - still jams - Manually running through both Nylon and ABS with a ~5" piece of bowden tubing sticking out - requires a LOT of pressure. sometimes nothing comes out at all would appreciate any and all ideas!