There is a discussion on Reddit, but I do not know enough to contribute:
https://www.reddit.com/r/Creality_k2/comments/1i4hm9r/extruder_error_cm2781278427862788_solutions/
UPDATE appears all good print started Friday Night and still going strong Saturday at 23:00 CST looking good
1 Like
Hello TIMHELLSTEN,
That sounds good 
I trust you will have a happy 3D experience from now on .
Cheers.
Here is hoping.
I have 80 rolls of filament on the way. And expect to use that up in under 2 months
2 Likes
I was able to recal and be good for awhile. It started doing it again after about 5 prints. All PLA.
Very frustrating. Probably going to return at this point after already replacing a board on my CFS earlier this week
Using 5.1
Are there slicers with support for K2 yet? Haven’t seen them being available in Cura, Prusa, and some others.
The author on link you provided is for the CR-10S Pro printer, not the K2 Plus printer. Other printers are printing CR-PETG fine, but not the K2 Plus. I’m sending mine back.
1 Like
Had the same issue with error CM2788. I was using overture clear PETG which it failed just before the 1 layer finished. Restarted machine, tried overture black PETG with the same result. (I printed smaller model with PETG without issue) loaded up some white PLA and model is now on 12th layer. Here’s the model I’m trying to print. I’m guessing the issue is with the latest firmware when printing large models with PETG. I’m going to try manually raising the z offset.
So I ran a flow calibration and that seems to have fixed the problem. When the flow doesn’t match the extruder it errors out when it errors out it thinks the flow is blocked by a jam or by a stuck CFS so it turns off the extruder motor to not burn it out and it doesn’t turn back on.
Try running both flow calibration and see if that fixes the issue. Hope it works for everyone else.
1 Like
Hi Josh, how does one do a flow calibration?
@FallEquinoxGuy, in Creality Print, configure the filament profile in slot 1 for the filament you are trying to calibrate.
Then, in Creality Print, select Calibration > Flow rate > Pass 1. It will slice it, send it to the printer.
Then follow these steps to calculate the new flow rate.
To run “Pass 2”, it’s under the same Calibration menu. Make sure you create a new filament profile in Creality Print and select it before Pass 2.
1 Like
There is a calibration menu on your printer to enable Flow and Pressure Advance calibration. Checking the box and doing a print with calibration turned on will print patterns left and right on the bed that it uses to measure and tune the printer.
BTW, CM2784 is not Firmware related and doing the calibration did not help my printer. They are sending me a new stepper motor and extruder as the fix.
1 Like
Please keep us posted to see if that fixes you error!
1 Like
Will do. Usually about a week to arrive by DHL out of China.
1 Like
I used the calibration menu do enable pre-print calibration for my non-creality petg all ended with the motor being shut down with error CM2788. Though maybe it was because I was using the side roll configuration to pull filament from my dry boxes. So took filament out of dry box and placed on side spool holder. Nope. Then I tried using the same filament in the CFM. Nope. Tried different PETG filament. Nope. Put in some non-creality PLA. Now on layer 12. So do you think the latest firmware update is causing this? Should I test by factory reseting? I didn’t buy an ENCLOSED printer to print PLA. My old snapmaker does that just fine.
This model finished without issue with the white PLA.
Bonjour,
J’ai le même problème, utilise tu un CFS ? De mon coté je soupçonne le CFS de bloquer le fil.
Je ne pense pas que le problème soit le tube car l’impression avec du PLA ne donne aucune erreur. Je suis convaincu que le problème vient de la dernière version du firmware.
De plus, j’obtiens la même erreur que j’utilise ou non le CFS.
2 Likes
So, i wanted to give you an update on my case (extruder motor stopped working entirely):
Creality sent me a replacement motor, i installed it, easy. (did not install the extruder at this point of time, first wanted to check movement of the motor)
Then went to the axis/temp page, preheated the nozzle, and tried to move the Motor
-
when i press “E up” i get the CM2784 error (Extruder extrusion anomaly, possible clog or blockage, motor released…)
-
when i press “E down” i get the CM2788 error (e step-servo hardware abnormal…)
The motor makes a short “click” noise in both cases (as if he tries to move), but does not start moving (rotation).
The old motor did not produce any erros at all, and did not even make any noise/movement, so was definitely dead)
So, contacting Creality Support again…
This is very sad news. Spare parts from China are coming to me, and if this doesn’t solve the printer’s problems, I’ll be depressed.