Strange Issue Suddenly Appeared
I have done several several hundred hours of prints with my MK2 since I got it in September and have had a great number of very good quality prints. Now in the last couple days it has started having a strange issue that appears to be in the same general area, or at least during the same line of movements. If you notice in pic1 that on the left I have on left a good quality print from last week and next to it one from yesterday. I thought maybe the file was corrupt, SD card issue, slicer issue, etc so I produced another stl and tried again with the same result. So then I thought I should try a completely different model, Pic2, but saw the same type of issues in the same general area?! Also you can see in Pic3 that it seems to carry that "problem" thru all the layers in that area. So I tried the third model, Pic4, and saw very much the same thing again?!
What could this be? Stepper motor issue? I have completely re-calibrated the machine and it seems to have had no impact on the problem.
Please help!! Thanks very much in advance!
Bryan
Re: Strange Issue Suddenly Appeared
Do another print in which you expect the same issue happening again. Then check during printing while the issue is happening if the hotend temperature in the LCD fluctuates and maybe also the hotend fan oscillates somehow.
I had something similar looking. The extruder didn't extrude any more material and the hotend fan was oscillating because the Rambo thought temperature is too low. By the end the reason was a bad crip connection within the plug of the thermistor and the extension wire which sits within the extruder assembly. I got rid of that plug and soldered the wires together. No more issues since then.
The spare thermistor Prusa sent me already had the wires soldered to the extension wires. I'd say that this indicates that there is/has been an issue with that connection.