Filament Broke Off - Won't feed through extruder (Prusa Mini)
 
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kuhnbrad
(@kuhnbrad)
Active Member
Filament Broke Off - Won't feed through extruder (Prusa Mini)

Attached are two photos from the Prusa Mini.  My son broke off the filament from the sensor into the extruder and the filament trapped inside won't load through the extruder (see second photo that shows no filament coming out of the extruder).  I removed the other side of the extruder and there doesn't appear to be any blockage.  What do you recommend to remove the trapped filament and get this working again? 

Posted : 25/11/2022 4:48 pm
Razor
(@razor)
Estimable Member
RE: Filament Broke Off - Won't feed through extruder (Prusa Mini)

Tough to tell for sure, but it looks like you have filament trapped in the PTFE tube just past the runout sensor. Loosen the screw on the sensor that clamps down on the PTFE tube to remove it. From how things look in the photo, I’m pretty sure you will find a little bit of filament in the long PTFE tube. You may get lucky by lightly running a hairdryer over the section of tube and gently pulling on the exposed filament with a pair of pliers.

I currently have a small piece broken off in that long tube. Unfortunately we are out of town for the holidays, and I did not get a chance to work on it before I left. I have to disassemble my extruder to remove the PTFE tubing and try to push it out from the other end. I have to work my way back from step 45 in the assembly instructions to get at the screw that holds it in place.

Mini+MK3S+Future XL

Posted : 25/11/2022 7:34 pm
kuhnbrad
(@kuhnbrad)
Active Member
Topic starter answered:
RE: Filament Broke Off - Won't feed through extruder (Prusa Mini)

Thanks.  So based on the picture in step 45, in order to remove the long PTFE tube, I have to remove the extruder as the screw to loosen on the PTFE tube is on the back side correct?  If so, that is a horrible design. 

Posted : 26/11/2022 1:52 pm
Razor
(@razor)
Estimable Member
RE:

I believe so. I had it apart once before but not for that reason. I had to clean out the extruder gear. While it seems like a pain it’s not as bad as you may think. Like everything reading through the instructions and preparing to do the work takes longer than the actual process, but in the end you will have a better understanding of how everything works together. I was as nervous as hell when I first took it all apart but it isn’t bad. Trust me.

While I don’t understand why the design is as it is, I’m glad we have the documentation that we do. I have a FlashForge Adventure and you are on your own for just about everything.

Mini+MK3S+Future XL

Posted : 26/11/2022 6:11 pm
kuhnbrad
(@kuhnbrad)
Active Member
Topic starter answered:
RE: Filament Broke Off - Won't feed through extruder (Prusa Mini)

Ok.  Is there a video anywhere that shows how to do this?  The instruction manual will work but sometime I like to see the visual as someone works through it.

Posted : 27/11/2022 2:20 pm
kuhnbrad
(@kuhnbrad)
Active Member
Topic starter answered:
RE: Filament Broke Off - Won't feed through extruder (Prusa Mini)

Does anyone else have any suggestions?  I really don't want to take apart the extruder to fix this? 

Posted : 03/12/2022 12:56 pm
Razor
(@razor)
Estimable Member
RE: Filament Broke Off - Won't feed through extruder (Prusa Mini)

There are only two screws you have to remove to access the screw that holds the PTFE tube in place, the ones in steps 47 and 48. It probably took me longer to write this post than it was to remove those two screws and take care of the blockage I had. You got this, trust me.

Mini+MK3S+Future XL

Posted : 03/12/2022 9:35 pm
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