I got myself a Vertex Delta K8800 a few weeks ago, and after assembling and calibrating the printer it worked just fine. But after some prints that came out like expected, I encountered issues with the bowden extruder. It works just fine for a while and then suddenly starts pulling back the filament randomly, which results in a poor printing due to a lack of material. When doing so, it does not sound and look like “normal” stepper motor operation. It’s more like the motor is jumping backwards about eight or ten degrees, pulling back the filament. This produces a loud and harsh noise. This repeats a few times, then the extruder returns to normal operation for a while until it all starts over again.
I examined the stepper motor which seems to be flawless. I also eyeballed the controller PCB, which also seems to be fine. Same applies to cables, connectors and solder joints. Finally, I checked the extruder motor’s trimmer alignment as described in another thread. I measured the voltage which is supposed to be 1,05V, and it’s spot on.
I urgently need the otherwise great printer to work again, so I appreciate every assistance. Thanks!
Greetings from Germany