Extruder clogged ?  

  RSS
jerome.r2
(@ironfish)
Active Member

I don't know if it's the same problem of the other topic (mauro-b) but since this morning i have some problem with the extruder.

I started to print a piece and after the first layer, the extruder began to print with difficulty. The filament was coming out by sacade and we hear some noise near the gears.

Tonight i managed to print a small piece for 10min. And now i can't even load the filament. The motor or the gear jump as if the filament was blocked.

I opened the hatch of the extruder and push the filament manually during the loading step. The filament comes out of the nozzle.

I don't understand what's wrong.

 

Sorry for my bad english, i'm french. ^^

 

PS : test with firmware 3.8.0 and the previous 3.7.2

This topic was modified 4 weeks ago by jerome.r2
Posted : 17/09/2019 9:19 pm
mauro.b
(@mauro-b)
Active Member

Until now I didn't find the where is the problem. The extruder seems to be not clogged but when the print gains speed, it starts to skip steps. I read a discussion where someone suggests to increase a little bit the current to the extruder motor with a gcode command but i didn't try yet.

 Today I tried a print with the new firmware 3.8.0 and PrusaSlicer 2.1.0 but nothing changed.

This post was modified 6 days ago by mauro.b
Posted : 08/10/2019 7:12 pm
bobstro
(@bobstro)
Famed Member

What filament are you printing with? Does the problem occur when you start printing infill? The Prusa maximum volumetric speed (rate) setting for PLA is a bit high for some filaments and temperatures. If you try to print too fast, the hotend can't keep up with melting filament quickly enough to feed it through and you can get extruder skips and jams.

You can try slightly increasing temperatures or dialing back speeds and see if that helps. I find that large infill areas where the Prusa speed settings are highest cause problems with PLA. I adjust the Maximum Volumetric Speed (MVS) setting under the Filament Settings to a lower value (11.5) rather than Prusa's default (15).

A quick test is to dial speeds back 50% using the front knob when the skipping occurs. If that helps, adjust your slicer settings.

This post was modified 6 days ago by bobstro
My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 09/10/2019 4:38 am
mauro.b
(@mauro-b)
Active Member

I'm printing with PLA. I tried Prusa PLA, Fillamentum and Amazon filaments. Yes, the problem is more evident when the speed increase. During the print, I noticed that the temperature is ca. 5°C under the target (205°). If I set an higher temperature, I see that the printer has some difficulties to reach the new setpoint.

Now I will try to decrease the speed. Thank you for the advice.

Posted : 09/10/2019 9:13 am
jerome.r2
(@ironfish)
Active Member

As far as i'm concerned, i tested with several filaments and the problem is the same.

The problem appeared little by little during the last print. Now the jump appears directly when I load the filament.

I tested with a needle to see if the extruder was clogged but nothing. I have clear the teeth of the motor gear.

The filament was coming out by sacade and we hear some noise near the gears.

Maybe can be tested by removing the nozzle?

This post was modified 5 days ago 4 times by jerome.r2
Posted : 09/10/2019 8:24 pm
mauro.b
(@mauro-b)
Active Member

@ironfish

My situation seems similar to yours

Posted : 09/10/2019 8:29 pm
jerome.r2
(@ironfish)
Active Member

when I insert the filament, the motor wheel rotates normally 2 or 3 seconds and when the filament starts to come out the nozzle, the jump begin and the filament go out by saccade.

Tomorrow after my job, I will test to remove the nozzle when he’s hot to see if the filament go out normally or not.

Did you test with a cleaning filament ??

Posted : 09/10/2019 9:07 pm
mauro.b
(@mauro-b)
Active Member

@ironfish

No, I didn't. Let us know.

Posted : 10/10/2019 6:18 am
Share:

Please Login or Register