Extrusion stops halfway through print  

RE: Extrusion stops halfway through print

Can you please confirm if the problem is completely fixed, as i have the same issue and I tried the same things with same results so I would like to suggest prusa the same solution for me.

RE: Extrusion stops halfway through print

I was able to reproduce a similar issue on my printer. It seems to stop randomly and I was able to get it while purging after purging for about 2 minutes. First it slightly buzzes, then you can hear faint taps as it stops. My first guess was just the idler wasn't pressing enough, but I tightened that about 4 turns and it had the same result. (I also tried loosening it about 3 turns when I was diagnosing). I know it's not a clog as I changed the whole nozzle setup as a first step, also it still can feed if I give a slight amount of manual pressure. I'm unsure if the extruder stops or not, but I'm only getting minimal grinding. I suspect it stops, as if I keep "purging" it doesn't seem to grind away the filament on close inspection.

The extruder gears appear clean and I've sprayed it with compressed air just in case.
I tried 3 cold pulls before switching the nozzle entirely.

Extruder stopping can be seen here

RE: Extrusion stops halfway through print

Update on my case: It was indeed the Nextruder Motor which Prusa sent me as replacement. Once replaced everything works like a charm again.

RE: Extrusion stops halfway through print

Status update on my case (I'm the OP...):  Replacing the idler components with PC+CF parts supplied by Prusa seems to have completely fixed the issue.  Haven't had an issue since.  I have also since upgraded to a MK4S, and I noticed that part of the upgrade is a set of PCCF parts for the "hot" areas  - the idler and y-axis tensioner.

RE: Extrusion stops halfway through print

Hi, I think my problem something similar. Did you encounter before that after 10 minutes of printing stops extruding, then leave the printer to fully cool down after let's say 3-4 hours press the print button again, and print without issue until again about 10 minutes and stops extruding?

I think something gets hot inside that prevent extruding but when it's cold no issues

RE: Extrusion stops halfway through print

I have the same problem today, I have already converted my nextruder to pc-cf with the mk4s kit so it can't be that.... I'm getting a new loveboard, but I'm guessing it's more likely the extruder motor

RE: Extrusion stops halfway through print

I replaced mine with the pccf as well about a week ago (under warranty - provided by Prusa). I haven't had any problems since and I've been printing on it for nearly 100 hours. 

RE: Extrusion stops halfway through print

I have had the pccf parts since mmu3 and mk4s upgrade...i waiting to my loveboard and the heatsink ntc

RE:

Wow, I took everything apart and found that the extruder motor was somehow stuck. I unscrewed it and realigned it. Now it does what it's supposed to...it must have jammed the filament recently...But if necessary I will order a new one 

RE: Extrusion stops halfway through print

Update from me: As the PC+CF parts are part of the MK4S upgrade they don't appear to offer that as an option in the troubleshooting process. However, they agreed that the motor might be at fault and sent me a new motor and gearbox which did end up fixing the issue for me.

RE: Extrusion stops halfway through print

I have 2 MK4 as well. One has the MMU3 and the other (older) one does not. Just this week the older printer started exhibiting the same issue described here. It would print the first layer fine, but then it would stop extruding on the second layer. I’m using old bgcode files that have used many times in the past year (printing shelves for an IKEA pegboard).

Anyway, I’m not seeing any temp increases / spikes on the UI, and the fans are both running.
Side note, at one point the heartbreak fan did get turned off somehow… I’m sure it was my doing when I was adjusting a setting…. But it’s back on now

Anyway, I noticed that the extrusion problem seemed to start occurring on the second layer, when the printer sped up.  For the time being, I just adjusted the speed to 50% when it hits the second layer, and that has corrected them extrusion problem.

I’m not saying this as a fix / solution, as those files had been printing fine w/ many different filament brands in the past year or so.  I’m just adding another workaround that happens to work for me.

Maybe it will help someone else’s printing headache until the actual root cause is determined.  

The upside is a successful (hopefully) print. The down side is it’s slower.

also, both printers and MMU have the latest firmware.

RE: Extrusion stops halfway through print

is your room temperature higher than normal?
You might be getting heat creep