I’ve been using the K2 Plus for about six months with generally good results, but recently I’ve run into a frustrating issue.
When attempting longer prints (~10 hours, ~350g), the printer consistently stops around 75% of the way through. The failure point isn’t consistent — it varies from print to print — and no error code is displayed when it happens.
From what I can tell, the nozzle or extruder gears seem to clog mid-print, preventing material from extruding. This has occurred four times now.
I’ve tried retracting and then extruding to get the filament flowing again, which usually works temporarily. To troubleshoot, I’ve already replaced both the nozzle and the extruder, but the issue persists.
Has anyone else experienced this with the K2 Plus? Any suggestions on what to check next — firmware, thermal issues, slicer settings, or something else?
It’s odd that you’re not getting any error messages…this happens to me but if it’s an extruder clog you normally get “filament cannot exit the extruder” or similar. In warm weather, the K2 Plus does seem prone to drawing softened filament up into the gears. Printing with the door open and/or lid off (depending on material etc) seems to help.
WHen mine did this it seemed to be that it retracts the filament using heat rather than the cutter. On PETG this seems to leave fine bits of filament and a bulge which stops it retracting or even loading properly. I have made a longer cutter and this seems to be a lot better
I’ve been using Hyper PLA and PLA-CF. The issue seems to happen more often with regular Hyper PLA. Just to make sure I understand: you’re saying the heat from the nozzle and the chamber softens the filament too early, before it reaches the nozzle. This early softening causes the material to get stuck in the extruder gears.
To fix this, you’re allowing some heat to escape from the chamber—by printing with the door open or the lid off. That reduces the temperature enough to keep the filament from softening too much and prevents it from jamming in the gears. Is that correct?
What do you mean by “using heat rather than the cutter”? Are you saying the printer retracts the filament by melting it instead of physically cutting it?
Just to clarify, I’m not changing materials during the print.
I agree that it happens at the reaction operation rather than the extrusion. I don’t think the machine cuts by heat though, at least not by design. That would lead to a lot of thinning and thickening of the feed material such that the. Machine would have no way of knowing how much material it had applied.
It is of course possible the cutter is less effective than it could be by accident, which is why a longer version might help.
Also check the “secret” magnet is in place securely; it’s under the panel on the extruder, over where the cutter sits. If it’s moved or moving, then that could cause the cutter to be less effective. A dab of super glue will hold it in place, but take care not to super glue anything else!
I am having this same issue with Hyper PLA. I have a brand new K2Plus and have not been able to complete a single successful print since getting it out of the box. I have reached out to Creality support but still waiting to hear back… Has anyone found a fix for this?
At this point I am wanting to just send it back and get a refund.