So I am still having the issue of my prints all getting flow failures

3D Printing
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So I am still having the issue of my prints all getting flow failures about 50min-an hour or so into the prints. I am running a fan on my hotend and it is as powerful as I can get. But still I am getting these flow fails and I do not know why. My extruder system seems fine. No slipping on filament nor skipping steps. I think it is something with the hotend. I also notice that when I pull the filament out of the hotend after a fail it is very thick on the end. Is this normal? Once again I am leaning towards a hotend problem. Does anyone agree or have any suggestions because this is driving me up the wall. I really want to order the new all metal ubis from printrbot but they are on back order so I’m waiting. In the meantime all suggestions are welcome.

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What hotend?

3

On my e3d v6 i didnt use a shroud on the fan and i get jams i use the factory shroud and fan and all problems go away

4

Are you using a geared extruder? What is your temp? Should be higher the faster.

5

Jhead lite v2.1. Running 30mm/s at 190c. I don’t have a shroud around it as I’ve never seen one for this hotend.

Would you say the e3dv6 is reliable? And could I use it with a printed mount or is the top still too hot?

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I’m a believer that all hotends should be actively cooled to create a quicker thermal transition for the filament. It really seems to cut down on the back pressure and provide consistent flow.

I would say the E3D v6 is close to perfect. The only issues I’ve had since getting mine have been from some very shitty filament.

I would guess that you’ve got some bad filament and/or a partial clog. Go get some nylon and do a few cold pulls to clean out the junk then switch filaments to see if the problem persists. You can get nylon at hardware store in the form of 0.65" trimmer line.

7

E3D v6 is completely cool to touch, I have mine in a mount printed with PLA with no issues. The top is always room temperature (at least with printing PLA@195). I was having similar jamming issues with my E3D v6 when using cheap filament, but I’ve switched filament and all is good now. In my case the cheap filament was the main problem causing too much resistance in the heatbreak and slipping extruder. After disassembling the hole thing to clear the jam I always found the end of the filament was much thicker than the rest because of heat expansion.