Unknown error during bigger prints
Hi there,
first time on the forums, have a small issue which occured twice in a row during a bigger print.
I haven't seen the issue directly, since I have my printer in the basement, it however (so far on larger prints/prints that take longer) blue screens during those prints. I have had similar printing projects in time and scale that went fine.
The first time after I printed it, I decided it might be too detailed to print and changed the settings from 0.1mm to 0.2mm detail, it still didn't help however.
I have yet to figure out what it might be, but it created a dump file for me to read, is there anyone who could help out and figure out what might be the problem with that file? I'd prefer not to waste much more material.
I have not noticed any issues with the door, heatbed, fans, extrusion etc. The one thing I would say has been noticeable is moving along the Z axis being rather loud, but that hasn't been an issue before or for smaller prints either.
Thanks in advance!
RE:
If you are printing largish objects, especially with long, fast runs of the print head, static charge build-up on the belt and motors is a problem that has been reported quite often. There is a long thread on this: https://forum.prusa3d.com/forum/prusa-core-one-hardware-firmware-and-software-help/core-one-crash-restart/
The underlying issue is that Prusa does not reliably ground the X and Y stepper motors. If the paint layer on the CoreXY mounting frame is "too good", the motors remain electrically insulated and a charge can build up on the moving belts and the motors. Eventually it will discharge through the insulation layer with a minimal arc, causing the printer to crash.
You can measure with a multimeter whether your motors are grounded. In resistance mode, measure between any of the four screw heads on top of each stepper motor and a chassis ground point (e.g. the screws in the lower front which hold the Z motors). If you measure high impedance, i.e. more than a few Ohm, the ground connection is missing.
The easiest way to ground the motors is via one of the four screws which hold the motor and its mounting block from below the CoreXY frame. Remove the screw, scrape off a bit of paint in the area below the screw head, reattach the screw. For a secure long-term connection, put in a star washer.