I was choosing between Creality and Bambu Lab, and I think I made a mistake.
When a print finished, the printer failed to cut the filament; instead of moving slowly and smoothly toward the cutter, it slammed into it at full speed. However, when I triggered the “unload” command manually, the cut happened without any issues. I concluded that this must be a software bug rather than a mechanical problem. After a restart and a factory reset—and by switching from my custom settings to the default slicer profiles—everything worked fine for about 5 prints. I initially thought I might have accidentally saved bad settings into the slicer along with a specific model, though the end-of-print behavior (like the movement toward the cutter) should technically be handled by the printer’s firmware and not overwritten by G-code from the slicer.
I was relieved, thinking it was fixed—but yesterday, it happened again. First, there was a loud bang. The print head missed the cutting pin and slammed into the left side multiple times. Then, during the “unload” process—see the attached video—the axes went completely haywire. The printer spat out 5 cm of filament and started jerking violently from side to side.
There is a sharp, torn tip at the end of the filament that was inside the print head. Also, after pulling out the Bowden tube from the back of the CWS (filament system), I noticed a notch on the filament—could the issue be located somewhere in that area?
This time, it didn’t even throw an error code; it just kept banging away, and I had to force a hard shutdown using the power button. If I hadn’t been home, would it have destroyed itself?
Pls help….