I’ve had my Taz 4 for about 6 months and have been happily printing away. About two months ago I ordered a Hexagon hot end upgrade and converted my old budaschonzle to a flexy struder. No problems there. I did notice on the new hexagon hot end that there seems to be a step in the filament path. It seems like the hole in the printed part and the hole in aluminum plate aren’t quite lined up. I have to rotate the filament to get it past this point. Once I do, all has been fine. Is this normal? I have printed probably in excess of 100 hours on the new hexagon hot end with no problems, until yesterday.
I switched back from the flexy struder and loaded a roll of black ABS, yes I flashed the firmware back to the taz 5 configuration. I ran a three hour print without a problem. I followed that with a 5 hour print, again with no problem. I started a second 5 hour print (different part) and about 3 hours into it it started to air print. I didn’t notice, so it air printed for about 2 hours Now I can’t get it to feed. I’ve done several (6) cold pulls with no luck. I heated the hot end to 240 let it cool to 170 and the pulled it out by hand. Any thoughts? Do I have to pull the extruder nozzle and soak it in acetone? Could the step in the extruder filament path be a contributing factor in my problem?