Hello,
I have a problem with the
of the K2 series.
When loading the filament, the feed rollers of the CFS create a deformation in the filament. Has anyone else experienced this, and have you managed to fix it? Or do you have any ideas on how to solve this issue?
Thanks for your time!
Looks like the gears are struggling to move the filament.
Does this happens with every filament and in every CFS position? Also, do you get the same result if you load your filament from the manual (side) spool?
No, only with the cfs and i load multiple filaments from Bambi creality and noname and it Happens every time.
This happens to me. I turned off auto CFS detection on startup. From the Creality app.
Hopefully this is the right order.
If you look at the damage to the filament, I believe, it is caused by the output motor spinning against a stationary filament - thereby grinding it a way.
I believe the root cause of this is that the three motors (filament input, cfs output and extruder are not synchronised therefore causing this cfs output wheel to spin therefore leading to the above situation.
I have also complained in other posts that the motors are not synchronised sufficiently and no tolerance computed for mis synchronised motors. When retracting you may get a retry message but it does not re cut filament when pressed. If you get “stuck filament” look to see if cutter is freely moving this will then prove its a synchronisation issue.
For me dont work. But thanks for ur answer 
Yes i believe that is a synchro Problem. You know how i solve this Problem ?
I have two
CFS and if I have to power down with the 2nd CFS having been loaded in the printer I end up with this on every single filament in box one.
The only other times I had this was when I had a bad nozzle that restricted flow.
When my extruder motor started to fail.
Hmm. I jammed slot two on my CFS (my fault, old brittle filament) but fixed it easily enough. However I’ve also had slot two display this behaviour with a known “good” silk gold PLA. On my first calibration of the K2 ( was it really only two days ago?) I got a failure on the cutter on self test. Could this be related?
Nope cutter failure is caused by blunt or bent blade or from not enough tension nozzle might not be in far enough. Or worse yet the blade has teeth from the extruder housing that grip the ptfe tube in place.
Thanks LeeKay. The same silk gold gave me a horrendous extruder clog last night; it wasn’t melted filament though - it was shredded yellow fluff. Slot two in the CFS again.
As to damage, I can see the gears are pretty hard on the filament. Can feel it on all material retracted through CFS…and on transparent PLA I could actually see the damage because it turned the originally crystal clear filament into a cloudy scuffed mess.
Hi everyone! I had the same problem with my 2 CFs – they worked great at first, then suddenly started grinding filament! 
I saw one video that advice to cut the top of the spring that push the filament all the way to the inside to the extruder but didn’t work at all so Ifigured that if the cfs is not pushing the filament all the way through the inside of the extruder that’s way the filament keeping grinding since it’s not grabbing the filament firmly so I increased the spring tension that I cut earlier by adding washers where the spring sits, and now my CFs are printing normally again! 
Hope this works fit youguys​:tada:
I was have same troubles, finally I’m find this video, where see what he did. I was make same think, and from this repear is everything ok for now.
PS Same thing I did on spring of extruder, where was same problems before.
Thanks for all your responses and solutions to my question. I have tested most of the suggestions but haven’t reached a final solution yet.
I shortened the springs (thanks for linking the video), and this actually helped reduce the damage to the filament. However, my problem now is that the filament loads up to the buffer and then gets stuck. I disassembled the buffer to check if there was a small piece of filament stuck or any signs of wear, but unfortunately, I couldn’t find anything.
I also sent the same question I asked you to the Creality support team and received a response. They sent me this video https://www.youtube.com/watch?v=hjwffUK-iL8&ab_channel=CrealityAfter-sale. I haven’t tested it yet—what do you think? Could this fix the issue?
Once again, thanks for your answers, and sorry for my late response!
I must say I am NOT impressed by that video; sure it shows how to change the feeder but it also shows how they put kinks into the ptfe tube.
No PTFE tube should have a kink in it and it is vitally important that they flow so it minimises resistance to the filament.
I have changed all my PTFE tubes as there were some that looked as though they had been inserted and extracted a number of times together and had kinks.
If you look at when the technician replaces the four feed tubes in the top of the CFS he kinks tube 2. He should be feeding the tubes in before laying the plastic holder down. He actually places the holder down and lift up the PTFE tube and kinks it.
Given we all have had these issues you wonder if its an accumulation of things like this.
