Ender 3 Max Neo - Not extruding

Ender Series Creality Ender-3 Max & Pro & Neo
1

Hi,

I have some odd behaviour with my Ender 3 Max Neo, I haven’t done much at all and am only on a second roll of white filament.

It has been printing fine (printed things with with white, matte black and light blue) and now it is missing whole rows on the matte black, and even when I returned to the white. I have done a number of things to test inc:
Checking thickness of filament = 1.75mm
Checking for clogs in nozzle.
Levelling and setting z-offset.
Correcting the eSteps.

What I am finding is happening is if I push the filament through (with preheated nozzle) it comes out of the nozzle fine and the start of the print is fine for the first few minutes (at standard 200C). Then it stops extruding.

I have to stop the print and when I release and pull back the filament (whilst nozzle is still preheated) it is incredibly difficult to pull back the filament which normally it is not. I have measured the end nearest the hot end, at there is a section that ends up being approx 2mm thick for approx 50mm.

On one occassion the filament snapped when trying to pull it back so I had to replace the bowden tube.

So new tube, new nozzle, levelled, estops done. Put new filament in and tried at a lower temp as I was thinking the heat is travelling too far up the filament, melting it and creating a plug that is stopping the extrusion. Same thing happened.

Removed filament and tried again at 195C, same thing again, but this time the fat bit was only approx 40mm long.

Is it too hot? The filament says 200C to 210C, I had previously tried hotter but then it starts to string.

Is there something I am missing, I am not sure what is happening, it is extruding too slow?

Thanks in advance.

2

Have you checked the cogs in your extruder? I have found that the cog sometimes get like filament powder build up in them and then they dont grip the filament properly. A small wire brush will get rid of it.

3

i currently have the exact same problem and still havnt resolved it because of a firmware crash. check the thermister cables. also try pausing the print right when it stops extruding and use an infared heat gun to check the hotends temp.

4

Hi

Thank you.

I dont think it is the extruder cog, whennit does stop, and i remove the filament, thre are clear teeth marks, so it is def gripping it. It works fine to calibrate the eSteps. It also feeds fine for a few minutes at the startbof the print.

I shall try to get a heat temp when it stops. I have to be reasonably quick when it does stop, as the filament cools then it is impossible to get out of the boden tube so it has be swapped out.

5

I think i have solved my issue.

The larger front fan, the positive wire had detached at the solder point on the fan.

Replaced and tested a couple of prints and everything is working as it should be.

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