Based on this thread and what I was reading on Reddit and Facebook, I decided to return mine while I still was in my return window. I got another K2+, this time from amazon (30 days return window on Prime). This one has been working flawlessly, but I did not upgrade firmware right out of the box. In fact, I disconnected the upgrade notices. I have also been using it with a CFS, also without issues.
I strongly recommend you try another unit. life is too short to waste debugging (for free) a big corporation product.
Check the r/Creality_k2 group on reddit. There are people that are concluding that this is a firmware issue related to flow rates and the firmware determining that there is some extrusion error and releasing the motors. Then not clearing the error, unless you turn off and unplug the printer.
Just remembering what I went through is giving me stress.
You will need to flash the necessary firmware file. Mine came with V57. You can get yours here:
Put it in a USB stick and insert it. The printer will see it and ask if you want to flash it.
After flashing, turn off the printer. Turn it back on. Do “reset” form the console. And that will basically be the “factory reset”.
factory reset after firmware upgrade worked for me im on the latest firmware and cp6 and all well dont even have to play with z height…doing a factory reset gives the option of clearing out old gcode files its one of the options on the screen…been printing nonstop since …
I’ve been struggling for a week now whit CM2784 and CM2788 errors… Nothing appears to work whit PETG… Even extruding is impossible. PLA working just fine…
I’m waiting for cp6 to release on apple chip. It took the printer a month to print for 20-40 hours at most, then 3 weeks of struggle, torment and disappointment
I also am printing with petg (ellogo) and i was able to print about 5 large parts using the ext roll, did the firmware update and the update to the slicer program, and the very next print it gave me the error for the extruder…
messed with it for about 2 days messing with settings and such and ended up going back to the firmware from nov and the 5 series slicer, now its running just fine again… I did do the calibration for the flowrate for this filliament and plan to upgrade the firmware again and use the new settings for the filament to see if this fixes the problem, if it doesnt ill just have to go back to the old firmware and wait till they fix the issue with a update.
So i tried to use the version 6 of the slicer and it gave me the same extruder error, so it has to be something with both the new firmware and the version 6 slicer software for PETG.
I have printed a lot with PTEG, but I have been using Creality PTEG-CR.
I learned using that same filament on my BL X1C that you have to lower the temperature 10 or 20 degrees and the works a treat on the X1C.
Perhaps the K2 thinks all PTEG is like their PTEG. So if you are using non-creality CR-PTEG, then maybe you have to teach it that the temperatures need to be higher???
I am getting the cm2784 as well. Disconnected the cfs and tried spool and same this. All my pla printed but when I went to petg that is all I get now at the start of the second layer.
Just an update from my side, printer still not working… not even with PLA. Tried old firmware didn’t worked, replaced nozzle didn’t worked. I’ve been doing some test and the only conclusion that i get is that the extruder just stops working for no reason and puts himself in safety mode. I’m losing hope white no viables solutions
Dear all, this is for sure not a firmware issue, this is a hardware issue in one of the extruder parts or extruder cabling!
I printed aside of all sort of PLA plenty of PETG from various brands, also ASA (which I always prefer over ABS) and also variants with GF or CF and had never this error, just once when my cutter was stuck and did not free the whole way to the nozzle.
Make sure that you get a replacement from Customer Support!
Interesting, so these repeated errors and poor first layers are most likely a bad/weak extruder? Does it make sense that PLA has an easier time flowing and that might be why there seem to be much fewer issues than with PETG/ABS/ASA?
This seems like a real gap in my knowledge and skill. What makes you confident it’s a hardware issue?
I made my statement because it looks that too many of your prints fail!
Is 1% of your (PETG/ASA/ABS) print failing or 10% or even more than 30%?
My prints do not fail and if they do I analyze and test and create a better filament profile and I usually have no failures anymore unless there is an hardware error or a extruder clog or one of the other issues (extruder or nozzle) related issues.
My findings for reasons why prints fail are (in order of frequency they happen to me from heigh to low):
Print bed not meshed or not cleaned
Filament settings wrong (flow rate and z-offset)
Print speed to high (here some other reasons)
PETG and ASA are twice as sticky or chewy than PLA, so to generate the same flow the extruder has to work twice as hard
I looked at some spec sheets of filaments, not all specify all items, some tell about max print speed and some speak about max flow rate. I found one which mentioned same print speed for PLA, PETG and ASA but the flow rate was only half for PETG and ASA (see the last point)
If somebody is saying that you can go up to 500 mm/s this might be valid for a 0.4mm line on a 0.16mm line-height which is then ~32 mm³/s, this is way too high for most of the filaments, with standard print settings of 0,42mm line with and 0.2mm height you end up @ 40 mm³/s! For example the vendor where I found both speed and flow rate mentioned for PLA <=200 mm/s and 21 mm³/s, for PETG <= 200 mm/s and 12 mm³/s and ASA <= 180 mm/s and also 12 mm³/s. The ‘Generic PETG’ in CP6 has a max flow rate set to 16 and if you print a standard 0.2 profile you end up to use up to 300 mm/s from 2nd layer onwards which is then limited by the 16mm³/s limit in generic filament profile to 190mm/s but the flow rate is still 30% too high. I set my may flow rate for PETG & ASA to 12 mm³/s therefore (as specified in the spec sheet or in the bambulab printer profiles for these filaments).
Print temperature wrong
If you have errors even considering that you did all right then the HW can be a reason there are tolerances in the sensors or the mechanics which can make a difference (for example at higher temperatures).
That’s a fantastic post about developing a process for eliminating variables. I hope I didn’t come across as being cynically doubting. Genuine thanks for that explanation.
