Core One - Rear Z axis lead screw stopped responding while bed was raising to start print.
This is a new Core One. Factory assembled.
This morning I woke up to a failed print. Big glob of TPU all over the extruder, a crunched fan shroud, and a torn silicone block sock. This was a routine print that has never failed before. No change in filament (same spool), etc. The print file is an array of small, short parts that cover the entire bed from front to back. The first quarter of the bed printed correctly (the front quarter). I cleaned the head and restarted the print, but when the bed began to rise toward its home & leveling position, the rear lead screw froze, causing the bed to ramp/angle up toward the front as the forward leadscrews continued. I'm not sure how bad the off-level condition got before I reset the printer, but it was pretty bad.
What just happened? Do I have a bad stepper?
RE: Core One - Rear Z axis lead screw stopped responding while bed was raising to start print.
you could try to switch off the printer or turn off the motors in the menu and manually turn the lead screw to see if something is binding... maybe some little piece of dirt went the wrong way and blocked the trapezoid nut... this is what I would it this were my printer. If everything seems to turn smoothly you could try to level the bad in this way and then moving the bed back down using the manual controls. Possibly the last 10mm I would release again the motors and manually bring all the lead screws to the bottom. If all this works, try setup routine with all the axes check.
If anything goes wrong here... I'd contact prusa support.