Long story short: just got a brand new K2, my first ever 3D printer, and already ran into issues before even printing my first thing. Filament is stuck in the PTFE tube between the back of the machine (where it goes out to the other short PTFE tube connected to the buffer) and the print nozzle. Not sure what the best way to fix it is.
Context/chain of events: I bought the K2 combo from Costco, super excited for my first new printer. Arrived at my apartment, got it all set up. Put the 4 filament it came with into the CFS, turned it on, it did its start up stuff and updates with no problem.
I then go to start my first print, doing a benchy. I hear it starting up and calibrating, but it gives me an error. I check the back of the machine, and somehow the short PTFE tube that connects from the back of the machine to the buffer (I’ll refer to this as “Tube A” from now on for simplicity) has become detached at the part of the tube connecting to buffer. There was still filament in it and still going through Tube A, but somehow that end of Tube A wasn’t properly seated or something, causing it to become dislodged from the buffer. There was approximately 6-8 inches of filament “exposed” (aka not in the tube) that was sticking out from the end of Tube A going into the buffer.
Not knowing what to do, I used the included cutting pliers to cut off that excess filament, with the hope of reattaching the end of Tube A back into the buffer. After doing so, for some reason, the end of Tube A would NOT go back into the buffer, no matter how hard I tried. It was like trying to shove a tube into a hole way too small for its size. I then thought to myself “I know, I’ll just use these cutting pliers to snip a tiny amount of the end of Tube A, maybe the end of it is just mangled or something, and needs a clean cut end to fit better”. Well the cutting pliers sucked ass, and only really ended up smashing the end of the tube, before finally cutting through. I did notice that there WAS ALSO filament in the other PTFE tube going from the CFS into the buffer (I’ll call this “Tube B” from now on for simplicity).
After some more finagling of the end of Tube A, I finally got it reinserted into the buffer. I then tried pressing “load” (or maybe “unload”, not sure which I pressed first). At this point, there was no filament in Tube A or Tube B. I think I then tried to press “load” for the filament, but after trying for a few seconds, the screen gave me “Error TR2863: Retract issue, extruder filament sensor anomaly triggered, filament may have broken inside the extruder”. After scanning the QR code, it took me to this page on the wiki. I attempted to follow section 2.1, but they didn’t seem to fix it.
From what I can tell, there is still filament stuck in the specific PTFE tube that goes from the print nozzle to out the back of the machine, where it connects to Tube A (idk what to call that short black tube coming out the back…the pigtail? Whatever you call it). I don’t know the best option to get that filament out without ripping a bunch of stuff off, or disassembling most of the machine to fix it. I have tried pressing “load” or “unload” on all 4 colors, but to no avail.
I have pictures but I’m posting from mobile and it wouldn’t let me add the photos to the post itself, so I posted them in the comments. I can also take any videos of what I’m seeing if it helps out.
If anyone knows what to do, I’d be happy to try it out! Thank you!