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Left Extruder jams

Posted: Wed Jul 03, 2019 4:03 pm
by Jay_Omega
I keep getting jams in the left extruder below the extruder gears,
where the filament goes through the guide hole.

There seems to be wear on the plastic piece, since the black
paint has worn off to show white plastic.

Jammed this time on 3DSolutech natural, but this has happened using other
filaments as well.

See attached photo.

Thanks!

Re: Left Extruder jams

Posted: Wed Jul 03, 2019 6:11 pm
by ocelot27
I don't think that's wear as the whole thing is made with SLS printing out of black nylon powder. Probably debris from filament that's worn off by passing though the extruder. Going to have to use the steel rod and find out where the obstruction is as per Raise instructions.

Re: Left Extruder jams

Posted: Wed Jul 03, 2019 8:58 pm
by Jay_Omega
Cleared out the jam.

The filament above the jam looks nice and smooth.

Below the jam (between gears and hotend) the filament is pretty banged up looking.
(see photo, left to right cleaning rod, right filament, left filament).

I'm running with less pressure on the filament on the gears. Maybe I was just
crushing the poop out of my filament?

Re: Left Extruder jams

Posted: Fri Jul 05, 2019 5:56 pm
by IliaT
It might be famous bad temperature sensor socket issue. We had filament jam issue all the time until we designed and built special bracket to hold the sensor wires still so they will not wiggle the socket interrupting contacts. After this fix the issue completely had gone.

Image

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Re: Left Extruder jams

Posted: Sat Jul 06, 2019 7:11 pm
by ocelot27
The image of the filament looks like heat creep to me - you can see where the rollers squished the softened filament.

Re: Left Extruder jams

Posted: Sun Jul 07, 2019 8:55 pm
by Jay_Omega
I didn't know there was a famous bad temperature sensor socket.
I'll look at that. Funny how all these machines have quirks and
idiosyncracies.

Heat creep - I had considered that but wasn't positive. Not sure how to
counteract that; I'll do some more research.

Thanks for the diagnosis!

I think "The Heat Creep" would be a good user name for a 3d print forum.

Re: Left Extruder jams

Posted: Thu Jul 18, 2019 2:30 am
by Jay_Omega
So, yes, it was heat creep.

I added some thermal compound between the heat sinks and throat tube.
Raised up the lid to keep heat down in the print chamber.
Lowered the build plate temperature.

Oh yeah and I replaced the front cooling fan. I'm pretty sure this is the fault of
Raise3D's poor design, and not me dropping tweezers or allen wrenches in the fan
while it was running.

busted_fan.jpg


I replaced the fan with a 50mmx50mmx20mm fan, so a bit longer screws and a little more
noise, but lots more airflow and more manly fan blades.

Printing like a champ now.

Re: Left Extruder jams

Posted: Thu Feb 06, 2020 6:34 pm
by IliaT
Some of you asked the cable holding bracket CAD model. Here is zip archive with STL file and X_T file of this bracket

https://drive.google.com/file/d/1GYQuQm ... sp=sharing