I got my K2 in November last year and printed about 10 projects so far, with little struggles and experiments along the way. So far so normal.
But since a while now the extruder knife keeps being stuck when I want to start a new project/try to extrude a filament.
Now I tried disassembling the extruder part, looking for loose filament, exchanging the nozzle, exchanging the knife part, even turning the knife upside down, putting some grease on it, tightening the screws and even leaving the screws a bit loose, since the knife is moving with no problem when the extruder part is taken off the nozzle head. It gets stuck when the head slams into the āknife stickā on the side of the printer, and when I loosen the screws and lift the part off the back a bit it āsnapsā back into position.
Now I ran out of Ideas what else I could try, since there are no moving parts in that area, except the knife itself.
Well, I didnāt try polishing it since I donāt think that friction is the issue primarily. As I said it slides in and out with no problem as long as the extruder is not put into place. And I used the word grease but I ment lubricant. I didnāt try silicone spray I might try that but again Iām confident itās not a frictional issue
Many people are complaining that the magnet on the cutter comes out all the time. Are you sure the magnet is still there? Check this Creality official video. https://www.youtube.com/watch?v=c0EKlBXRflk
Got the same problem: cutter works fine when extruder is disassembled. With extruder assembled cutter sticks in cutting position.
What worked for me: loosen the nozzle a tiny bit released the cutter and now its working fine again.
Dont know what caused this in the first place thought :-/
Yeah I tried something in the likes to this already, didnāt work for me tho.. Do you mind explaining what exactly the process was that lead to this success?
Absolutely positive. As I said. When I take the part off (the one where the gears and the cutter is in) the cutter slides and snaps back as intended. Itās only a problem when itās back in the operating configuration when it gets stuck
In my case I did loosen the nozzle a bit and the cutter worked again.
See Replace K2 Plus Nozzle | Creality Wiki
Step 4. Use a straight socket wrench to unscrew the old nozzle
I just did this, loosen the nozzle maybe some 1-2mm and the cutter worked again.
I had the same problem, assembled I would get the ācutter jammedā fault and pulling it apart the cutter was free as a bird. Cutter is 100% mechanical was stiff and libel to jam when print head fully assembled, yet it freeāed up when print head disassembled. Only possible cause is physical interference and so it was. Nozzle tightness had nothing to do with it, it was replacement extruder motor I had installed causing the problem. I bought the extruder complete assembly as it was on special, however, I have only installed the motor from it in my machine. Upon close inspection of the motor, I noticed the translucent inside cover, as opposed to the nice shiny black housing, extended about 3mm from the housing all the way around and, sure enough, it was this overhang which was interfering with the cutter operation. I gently filed off the section of the cover that was causing the problem back to the main body and problem solved.
