Persistent printing problems  

RE: Persistent printing problems

Can you elaborate a little:

Filament, Slicer & settings, ambient temperatures, bed cleaning method?

Do you see the same problems with the Gcode which came on the SD card?

RE: Persistent printing problems

Filament is PLA, ambient is 25C, nozzle at 215, bed at 60, and all other settings are basically the default values which Slic3r gives for PRUSA i3 MK3S. As I mentioned, I use Slic3r. The standard G-codes and all the prints after them were fine, until a month ago. 

One thing that concerns me now that I think about it,  is that the nozzle oozes a little bit of filament while it heats up, but a while ago I read somewhere that this is somewhat normal.

RE: Persistent printing problems

Is the set screw of the Bondech gear really fixed? (Extruder motor shaft)

RE: Persistent printing problems

Looks like a typical nozzle crash; where the nozzle is catching on solid infill that is curling / warping. White filament is hard to see, but that's what it looks like in the photos.  That and supports are failing (adhesion is one common reason that happens).

RE: Persistent printing problems

I will check the Bondech gear set screw now, it could be it. Also I am checking the nozzle frequently while it is printing, when I am near and it doesn't catch on anything.

RE: Persistent printing problems

You have parts breaking loose from the build plate. That is either poor adhesion due to bed contamination (very common problem) or the nozzle is colliding with filament fragments from failing supports or from nozzle colliding with infill curl; or a combination. 

I'd be happy to look for anything obvious in the part design. Post your STL (zip it then insert the zip). 

RE: Persistent printing problems

Posted by: Tim

You have parts breaking loose from the build plate. That is either poor adhesion due to bed contamination (very common problem) or the nozzle is colliding with filament fragments from failing supports or from nozzle colliding with infill curl; or a combination. 

I'd be happy to look for anything obvious in the part design. Post your STL (zip it then insert the zip). 

Thanks for the reply but it isn't that because all the parts remain stuck to the bed. This time I saw the problem while it was happening. I saw that the extruder was clicking and no filament was coming out of the nozzle. This is picture of the result:

I read on the internet that the cause could be: Extruder screw being too tight, irregular filament diameter or clogged nozzle. I checked the nozzle and it is fine. I cleaned the extruder gears and readjusted the screw like they say in this video: . but it is still doing the same thing. Here is my STL: Carrier

Nothing I try seems to resolve it and I'm really desperate already.
 Edit: I also tried temperature calibration and the problem is still there.

RE: Persistent printing problems

A couple of things to do:

• Do another cold pull, post a photo of the cone end.
• Next jam, immediately unload the filament, post a photo of the melt end.

RE: Persistent printing problems

Okey,I did these things and  took a lot of pictures so you guys are not in the dark. First I did the cold pull before starting any prints for today. This is what it looked like:

.
Then I started the print and stayed there until it jammed. Then without touching the extruder I started First Layer Calibration and here is the result:

Then I coldpulled the filament out of the nozzle and here is how it looked like:
And finally, I noticed that the extruder stepper got VERY HOT while printing and then it failed. My theory is that the hot stepper is heating the bondtech gears and then the filament, which makes it soft and impossible to extrude further. Please, do correct me if I am wrong. Could this cause the clicking and the jamming and is there a solution?
Thank you all!

RE: Persistent printing problems

The same problem is happening to me I bought my MK3S a month ago then I started printing some stuffs then suddenly this problem occured and still. 

I was using Silver PLA then I asked some friends they said me to change the filament, PTFE inside and also the nozzle I did everything and inserted Prusament PLA Prusa Galaxy Black but the problem continues.

I don't know what to do because to buy a new heatbreak is not an option since it is brandnew )=

can someone help us?

it is kind of frustrating :/

RE: Persistent printing problems

Posted by: cheinsawer

Okey,I did these things and  took a lot of pictures so you guys are not in the dark. First I did the cold pull before starting any prints for today. This is what it looked like:

Then I started the print and stayed there until it jammed. Then without touching the extruder I started First Layer Calibration and here is the result:

And finally, I noticed that the extruder stepper got VERY HOT while printing and then it failed. My theory is that the hot stepper is heating the bondtech gears and then the filament, which makes it soft and impossible to extrude further. Please, do correct me if I am wrong. Could this cause the clicking and the jamming and is there a solution?
Thank you all!

This bit of the filament: if you have calipers, measure the diameter. If it is 2.2 mm you are having the heat break jam.

The solution is to replace the heat break with the stock E3D-V6 version. Long story, Prusa mods the heat break with a step that is intended to help MMU feed issues -- but it also causes jams with higher complexity parts (lots of retractions).

RE: Persistent printing problems

It seems to be bad )= why should I replace something that has less than a month of use... kind of disappointed...

Anyway I'm going to replace it, thank you!

RE: Persistent printing problems

Just be sure you measure it, accurately; if it is only 2.0 mm, then it isn't certain it's the heat break problem; but if it is 2.2 mm, it's s known problem that many of us have faced; and been very happy we swapped for the E3D-V6 stock heat break.

Another symptom is after it jams; you unload the filament and trim that stub, the print works quite well again, nothing else done. Then, some time later it jams again.  Often, when reprinting a part, it will jam at the same level as the last attempt, like this example of mine. That print was the last straw for me. Printed without incident after heat break replacement.

And here are stubs from that print.

The final print with new heat break:

RE: Persistent printing problems

Lol if it strings like that the nozzle temp is too low

RE: Persistent printing problems

Posted by: stephnjim01

Lol if it strings like that the nozzle temp is too low

Stringing usually indicates the temp is too high and you're getting some oozing.