I had an issue that started with extrusion just stopping mid-print, so I replaced the extrusion stepper motor and I have nothing but a series of problems ever since.
after replacing the motor, trying an extrusion test did nothing, no movement
tried replacing the cover and the gears first, nothing
replaced all the PTFE in case it was dragging too much, nothing
replaced the hot end circuit board, now at least the motor clunks but I still get a CM2784
So I replaced the entire extruder. The new one has a serial number of 2503… so I’m assuming it’s pretty new (might even be the updated version). Same symptom clunk clunk clunk CM2784.
I’ve tried this with the CFS and without. I’ve done a factory reset and reran all the calibrations. I’ve replaced everything but the mainboard at this point and I think that is next.
I am sitting with the same problem. I bought a new printer and did not print a single model. I only managed to replace the motor that I bought with my own money. On the original motor, it made noise like a hoarse dog, but as soon as it felt the filament stop, it immediately pushed it out of the extruder (with error CM 2784). On the motor that arrived, it makes short clicks and then the error CM2784 pops up. It’s a fiasco(
I printed many months before I had my failure, which I thought was a motor failure. It just stopped extruding in the middle of prints. Replacing pieces trying to get it running again is where things went wrong for me. How did you fix yours? My K2 is still down.
I don’t know why it isn’t listed as the next step after replacing the motor, but that solved a similar situation for me, where the replacement motors just twitched and didn’t rotate. Now I wonder if I had to replace the original motor or other boards at all.
