filament wont feed clicking sound ....
only printed a couple things since we go the printer in January and went to print our first multi hour print the other day. everything started ok checked on it ever half hour or so and after about 3 hours we noticed that the filament wasn't feeding. Stopped the print job and when we went to restart the filament wouldn't feed and we got this clicking sound. I can feel it pull just a little on the filament but just doesn't go anywhere.
any ideas?
RE: filament wont feed clicking sound ....
It sounds to me like two things could be happening. I’d first try doing a cold pull of the filament, as the extruder could be clogged. If you can’t cold pull it, heat up the nozzle to a high temp and try to force it out. If neither of those work, try tightening your tensioning screws and check to see if the bond tech gears are stripped/dirty.
RE: filament wont feed clicking sound ....
If you unload the filament and see stubs on the end, measure them. If they are 2.2 mm in diamter you may want to consider a new stock E3D-V6 heat break to replace the modified Prusa versions.
ps: your images didn't make it ...
RE: filament wont feed clicking sound ....
we're hopping to work on it this afternoon -evening thanks for the feed back and ill try again on the video
RE: filament wont feed clicking sound ....
lets just post a link to the video ....
https://www.dropbox.com/s/g5ccbpmajiwli2c/20190628_150300.mp4?dl=0
RE: filament wont feed clicking sound ....
Hi,
I have this same problem, after close inspection I found stuck filament in hotend radiator.
I tried manualy push jamming plastic by pice of filament under 270 degC, but it did not help(fresh filament don't want stick to old one).
Nozzle is permable on 100%.
Maybe somebody have a solution? Pushing jammed filament backward is a good idea?
RE: filament wont feed clicking sound ....
Small update:
I try push backward this filament using copper wire wound aroung solder iron(like on picture below) - success! 🥂
Diameter of copper wire - about 1.3-1.4mm
Diameter of jammed filament - exacly 2.2mm
RE: filament wont feed clicking sound ....
This is so funny to see --- drag and drop the video into the text box and it will upload to the forum. It is wasted effort linking to sites many of us don't have access to, like your personal space on Dropbox.
RE: filament wont feed clicking sound ....
original video
RE: filament wont feed clicking sound ....
hmm.. looks like the video still inst work but anyway....
so what we found was filament in the white PTFE tube. couldn't push it either way and couldn't get the tube/filament out of the metal heat break. Our solution was to place the PTFE tube and heat break on some aluminum foil in the oven at 225 for about 10 min. What we found when we looked at it was the filament was sticking out of the top of the PTFE tube about a quarter inch but was still stuck in the heat break. The PTFE tube slid off easily and allowed us to get a grip on the filament and it pulled free from the heat break with just a good solid tug. we don't see any damage to any of the parts so we are ready to put it all back together.
So I guess the question at this point is. Why did it happen and how do we avoid it in the future? 
tim-m30: I'm getting 1.62 below the bulbous part. The widest part is 2.18 (pretty close to 2.2) and the upstream measurement is 1.74 so if you don't mind catch me up here, whats the Issue?
RE: filament wont feed clicking sound ....
same problem here, jamming at the end of plastic tube, bulbus end etc, hoping for a solution. I've produced 10x more garbage than parts. Waiting for a response from Prusa's after detailing everything to their customer support (saturday)..until then the Prusa mk3S is doing a great job of holding the bench down!
RE: filament wont feed clicking sound ....
It's Prusa's "Better Idea" for a heat break that will accomodate untrimmed filament that has been removed from the extruder. You know, that filament that you just unloaded that has a long stringy mess at the end you as a person will trim off before loading that spool again. Well, the MMU doesn't have a trimmer, so that hair is still on the end of the filament when it changes back to that spool. The hair folds over on the filament, adding to the filament diameter. 1.75+.30= 2.05 mm. Unfortunately, that's .05 mm more than the stock E3D-V6 heat break diameter and you get a heat break jam when using the MMU. To fix this, Prusa has E3D modify the heat breaks they sell to Prusa to have a 2.2 mm diameter down to the transition zone, about where the heat break enters the heater block, but not quite. The heat break then steps down to the normal 2.0 mm diameter. With lots of push-pull and right filament and temps, melt oozes out of the transition zone and up into the 2.2 mm cold region and solidifies. You now have the extruder pushing 2.2 mm filament into a 2.0 mm hole.
Of course, this is all conjecture... but since I replaced my Prusa mod heat break with a stock E3D heat break, I have not had a single filament jam.
RE: filament wont feed clicking sound ....
Thanks tim-m30! i appreciate the info