RE:
The print of the big model finished properly without any spontaneous crashes/reboots. Looks like this solution https://forum.prusa3d.com/forum/postid/753098/ from @darkmattermaker has solved my issue. Thanks!
I have my Core One (assembled) for about 2 weeks now and I was able to properly print all of my own 3D models, first in PLA and then later in PETG. Most of my existing models were equal or smaller than 116 x 58 mm on the build plate. Today, I tried to print for the first time a bigger model (X:200 mm, Y: 120mm, and Z: 53mm) and it didn't go well. I found out that I got spontaneous reboots during the print and after rebooting the print resumed, but crashing/rebooting again after a few minutes. I tried to switch to slower profiles in Prusa Slicer, however, the problem persisted for 3 different slicer settings. Then I tried printing my smaller model again (116 x 58 x 30 mm) and that went smoothly again. I found this article on the forum and based on it, I started measuring the resistance between the case earthing (PE cable connection) and the X and Y stepper motor screws using a multimeter. I found that the resistance was very low for the Y stepper motor, however, the resistance between the X-axis stepper motor screws and the chassis was very high. I mounted a cable similar as shown in this article to make sure there is a proper connection between the housing of the stepper motor and the housing. I have now started a new print for the big model (200 x 120 x 53) and after 1 hour and 40 min of printing no issues anymore. I keep my fingers crossed that it continues like this for the remaining 4 hrs to go (I am printing with the 0.25 mm STRUCTURAL profile now. If this print succeeds, I am going to test the high speed version.
RE: Core One crash/restart
I'm curious, is there anyone here that has heard back from Prusa support with an alternative solution?
RE: Core One crash/restart
I did hear back with my support contact citing the “unofficial” solution shared here - though he said it wasn’t an “endorsed” resolution… 😉
I'm curious, is there anyone here that has heard back from Prusa support with an alternative solution?
RE: Core One crash/restart
I didn't bring up with support. I haven't retried the same print again (it was multiple of the same item that I managed to print individually cause I didn't want to waste a roll of filament again). But I've printed several things since and no issues. Previous print that was crashing, I believe it was crashing when moving between copies (rapid diagonal movement.
Glad it seems to have resolved it though...
RE: Core One crash/restart
Solved for me!
I had the same problems, failed 1-2 times during 1st layer test (tested 3 times, failures came in every run) (just added a cube in the slicer itself 250 x 220 x 0.2mm). I removed 1 screw per motor (X & Y) scratched the poweder coating away where the head of the screws touches the gantry. (I used the allen key and a cutter knife)
I did the 1st layer test again without failures, I hope this is now solved!
RE: Core One crash/restart
Hi folks,
I just ran the same issue on my Core One, with a big print (200 x 200 x 12 mm) running in vase mode, so a lot of X and y moves. I contacted support, they told me it was a known issue with the core one. They will examine my case and come back. in three weeks (!).
I given them this topic so they can learn some useful tips about this problem.
In the meantime I will:
- check the resistivity / conductivity between motor screws and grounding / chassis
- scratching the paint and adding a dented washer
- and testing again
I noticed that on the crashed prints, when I remove the print, it sticks to the plate because of static electricity.
So here I go!
Thanks for the tips!
RE: Core One crash/restart
I promised to do another test with a high speed printer setting after doing my modification ( https://forum.prusa3d.com/forum/postid/755339/). Today, I did the test the 0.25mm SPEED preset with PETG and it worked also without any problems (printing time 4 hrs and 9 min).
RE: Core One crash/restart
For anyone who has implemented the stepper motor grounding fix, has the rebooting/crashing/puppy error resurfaced at all? I believe I was experiencing the same issue, I just didn't realize what was happening. I kept noticing on some of my longer taller prints, there would be a few spots in the print where it was leaving extra oozed filament. One night I just happened to be at the printer and it randomly rebooted, so I am surmising that the printer was rebooting and the filament was oozing in the spot where it stopped. This morning I awoke to the puppy error for the first time and that led me to this forum topic. I used a Dremel to remove some of the powder coat on the X and Y stepper mounting screw holes and I now have continuity to ground. I hope this is a long term solution and I can print in peace 😊
RE: Core One crash/restart
Just to add a little more context, I checked the printing status in my Home Assistant, and it looks like the print status went "busy" 7 times before it went unavailable. I am guess those busy periods where reboots.
RE: Core One crash/restart
Mine has not crashed again after grounding the stepper housings.
RE: Core One crash/restart
Same for me, after making sure that there is good contact between the X/Y stepper motors and the metal chassis (I used a multimeter to check for low resistance), I have not seen any crashes/reboots anymore. I did quite some high speed prints of big objects in the meantime. So I assume this is a permanent fix for this issue.
RE: Core One crash/restart
Hi, I just checked. My motorscrews are not grounded, but luckily I did not have any issues yet. Why might that be ?.
RE: Core One crash/restart
It only happened with my printer when I printed big objects (in both X and Y directions). These bigger objects cause a lot of big printhead / belt motion, which can lead to static electric charging of the motors by the movement of the belts to a point where they will discharge between motor and chassis, leading to the crash/reboot. With small objects, so not covering a big part of the build plate, I didn't have this issue (less belt movement, so less static electric charging). Another reason I guess could be that the humidity of your environment is higher, which might counteract the static electric charging.
RE: Core One crash/restart
Since I grounded the stepper motor screws I have not had a reboot. I am printing the parts for the Coreboxx and have been able to go 2 full beds of 14 hrs and 18 hrs without any issues. Hopefully this is a permanent fix.