I can’t do anything to get the filament to cut.
The brand new cutter that came with it cannot cut PLA. I tried to manually cut PLA while holding the cutter or with it in my hands inside the extruder front housing.
Maybe it really needs to slam against that cutting post on the left? I stuck a screw driver on the cutter and could not press hard enough to cut the filament.
This as reliable as the Ender 3
Check here https://wiki.creality.com/en/k2-flagship-series/k2-plus/replace-cutter how to remove and check/replace cutter. There was a spare cutter coming with the machine in case it’s really dead, but in my cases the cutter was just stuck in there because something was in it’s way.
It can be that cutter push rod is broken as well,https://wiki.creality.com/en/k2-flagship-series/k2-plus/replace-cutter-push-rod, the printer included also a spare one!
p.s.: when cleaning or changing it please calibrate it again!
Thank you, Frank. I will check that the cutter is in upright and that the post is okay shortly.
It happened to me also, ended up it was a small piece of metal stuck on the magnet on the extruder side (in the hole where the cutter fits) … check that!
“It happened to me also, ended up it was a small piece of metal stuck on the magnet on the extruder side (in the hole where the cutter fits) … check that!”
Yes, I found metal blocking mine too. I had that extruder front end completely apart look for more metal fragments and used a carb cleaner type brush to make sure the filament path was clear. The cutter, even with a new blade, still does not work.
I tried manually cutting a piece of esun PLA and I could not cut it manually. Those blades couldn’t cut through butter. Maybe they need a good forceful “chop”. Even after the cutter calibration the “chop” is not that forceful.
So, I am still not sure what the hell the problem is cutting filament. I am going to replace the chopper post on the left side if the chamber, although it doesn’t look broken. Hopefully, someone came up with an STL for it that can be printed in ABS. I love buying and storying spare parts for my printers but there are so few available at this time for the K2 Plus.
Yesterday, I swore I was going to spend more money and buy a X1C MAX when it comes out and put this K2 in a corner (can you tell I am frustrated with it? LOL). I went back to the Bambu forums (love my tiny little BL X1C) and those guys are telling Bambu they will never get another $$$ from them. They are really pissed off with Bambu Labs upcoming software updates that will disable ORCA from talking to the printer and the possibility that their printer will only work with Bambu Labs filament and lock out all others. Well, shxt, I only use the cheapest filament I can find on Amazon, a lot of times $12/13 rolls and they work great to the X1C, So now, I doubt I’ll buy the large format X1C from Bambu.
This K2 prints amazingly when when it feels like working. Last night I put the ESUN pla on the external spool holder, with the CFS not even wired in to the printer. Knowing the filament cutter is not working, it completed a 7.5 hour print beautifully. I wasted a lot of filament trying to make those parts until I figured out and extrusion error possibly clogged print head errors means the part warped and the head kept pushing in to the warped section. Does not Creality use that AI Camera in the printhead to monitor the print and come up with a human readable error message?
It will get better as time goes on.
Dave
I had this same issue. At first it was intermittent; the filament would cut most of the time but occasionally would not cut all the way and then would jam. A couple of weeks ago, the issue got worse to where it would not cut at all. After many attempts and disassembling the extruder multiple times, I noticed it appeared that the cutting blade was not pushing far enough into the extruder. I don’t know what may have caused this, but I’ve recalibrated several times after patches etc. and this did not fix the issue, so I turned to a hardware fix.
I removed the filament cutter rod and modeled a spacer to fit behind it. The spacer allows the cutter rod to extend slightly further into the extruder and push the cutting blade far enough that it effectively cuts the filament every time.
Given that the tolerances are fairly tight, the spacer is sized at 1mm with the intent you can scale up/down or print multiples and sandwich them together until you find the appropriate spacing to allow the cutting blade to reach far enough but without pushing too far and causing damage to your extruder. I started small, with just 1 spacer and increased until I found the right thickness to cutoff the filament consistently (I ended up with ~2.5mm of spacer on my K2 Plus).
I’ve run my K2 for several hours on a color changing print and then disassembled the extruder to look for any signs of wear on the inside (any potential indication the cutter was pushing too far into the extruder) but I did not see any signs of this.
I uploaded my model here:
Creality Cloud -K2 Plus Cutter Rod Spacer From KGS_Engineering
Here’s a couple of pics:
Hello KGS_Engineering,
Thank you for experimenting and finding a fix and then posting it for others that it may assist.
Cheers.
Can you post this on printables since creality removed it?
Uploaded to Printables since Creality is reviewing my model/upload on their site:
https://www.printables.com/model/1234165-creality-k2-plus-cutter-rod-spacer
Part of the problem I think is that the cutting blade is a wedge tip instead of a chisel tip. The wedge tip causes the blade to deflect if it doesn’t cut perfectly and then binds it.
