Printer randomly goes 0, 0 and back to printing while prining.
 

Printer randomly goes 0, 0 and back to printing while prining.  

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Hooch
(@hooch)
Trusted Member

Hi.

Yesterday I finished building my MK3S+ kit (This is my second  MK3). I calibrated it, added sock, PID tuned etc.
It prints just perfectly (no ringing [I greased bearings so I guess it helped]). I added heatsings to all stepper motors to keep them cool (which works super great).

I noticed now, while printing the dog included on the SD card that it went to X:0, Y:0 randomly during print and went back to printing without any failure. I also noticed the same while printing small custom print, it happened once after 2nd layer.

Firmware: 3.9.3.3556
For dog I used file included on SD.
My print, I sliced with Prusa Version 2.3.0+win64

In attachments, I include gcode files.

Why is my printer going to 0,0 while printing and then continuing like nothing happened?

This topic was modified 1 month ago by Hooch
Posted : 15/01/2021 2:47 pm
Hooch
(@hooch)
Trusted Member

And here is the dog gcode.

Posted : 15/01/2021 2:48 pm
bobstro
(@bobstro)
Illustrious Member

You need to zip any files and attach the compressed archive to a message here.

This post was modified 1 month ago by bobstro
My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 15/01/2021 4:01 pm
bobstro
(@bobstro)
Illustrious Member

Just to confirm: You are NOT using OctoPrint, correct?

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 15/01/2021 4:25 pm
Diem
 Diem
(@diem)
Reputable Member

@hooch

What do the Fail Stats say?

Cheerio,

Posted : 15/01/2021 5:14 pm
Peter in Katy
(@peter-in-katy)
Estimable Member

Turn off crash detection.  See if that helps.

Posted : 16/01/2021 3:09 am
Hooch
(@hooch)
Trusted Member

Statistics shown that it crashed at Y axis. No idea what caused it.

Posted : 16/01/2021 10:17 am
Hooch
(@hooch)
Trusted Member

Y axis moves very smooth. Belt tension seems ok (260). Prints came out excellent quality. Steppers are cold (I 2-3 40x40x11 radiators to all of them.

Posted : 16/01/2021 10:35 am
morphias
(@morphias)
Trusted Member

Its false crash detections and I and quite a few others have reported this since installing the 3.9.1 firmware.

It absolutely plagues long prints with big perimeters and trashes what would have otherwise been a flawless print.

Its been raised on the firmware GitHub  with no response from the developers. I cannot see anything in the later firmware release notes that say it's been resolved. 

Disabling crash detection stops the issue, but is an unacceptable workaround because, when a REAL crash happens; the printer will just smash through it and keep going. This could easily end in severe damage to the printer.

This post was modified 1 month ago by morphias
Posted : 16/01/2021 12:21 pm
Diem
 Diem
(@diem)
Reputable Member

Among the common causes of Y axis 'false' crashes are:  (in easy-to-check order)

Objects or wiring obstructing the path.

Debris clogging the Y idler pulley - but you haven't created much debris yet.

Y idler not straight or bearing failing (often due uneven pressure/friction when not straight.)

Damaged or wrongly installed Y belt, inc wrong tension.

Dirty Y axis smooth rods.

Y drive pulley loose or wrongly installed - inc grub screw misaligned.

Y axis smooth bearings distorted by overtight U bolts.

Y axis smooth bearings failing due clumsy installation.

Internal bearing in Y axis stepper failing.

Cheerio,

Posted : 16/01/2021 6:13 pm
Area51
(@area51)
Prominent Member

Even when all the mechanical parts work well and no obstructions while printing, I got y-crash detection on both my MK3S machines. Gave up finding the cause and disabled the crash detection.

I am sure it happened along the way of upgrading to 3.9.1. No failed prints after disabling crash detection.

It would be nice to have a way to lower the sensitivity of crash detection on y-axis, as this is the only one I have problems  with.

Have a look at my designs on Thingiverse or on PrusaPrinters ;)...
Posted : 17/01/2021 2:58 am
morphias
(@morphias)
Trusted Member
Posted by: @area51

Even when all the mechanical parts work well and no obstructions while printing, I got y-crash detection on both my MK3S machines. Gave up finding the cause and disabled the crash detection.

I am sure it happened along the way of upgrading to 3.9.1. No failed prints after disabling crash detection.

It would be nice to have a way to lower the sensitivity of crash detection on y-axis, as this is the only one I have problems  with.

Agree 100%.

 

No mechanical issues at all and only started after upgrading the 3.9.1

Posted : 17/01/2021 4:54 am
mGoleta
(@mgoleta-2)
Eminent Member

Does the problem go away by reverting back to an earlier version?

Posted : 17/01/2021 7:12 am
Area51
(@area51)
Prominent Member

Haven't tried to revert back to an earlier version.

For now I live with the disabled crash-detection, but it is far from optimal.

In the Prusa M-code list, there is: M916 - Set TMC2130 Stallguard sensitivity threshold

It looks like this can be used to control sensitivity for stall and crash detection, but I have no idea on how to use it...

Have a look at my designs on Thingiverse or on PrusaPrinters ;)...
Posted : 17/01/2021 4:03 pm
Area51
(@area51)
Prominent Member

Y axis crashes for no reason, seems not to be a new problem. I found this thread: Y-Axis fake(?) Crash detections - let's debug from 2018.

Have a look at my designs on Thingiverse or on PrusaPrinters ;)...
Posted : 17/01/2021 4:20 pm
Hooch
(@hooch)
Trusted Member
Posted by: @mgoleta-2

Does the problem go away by reverting back to an earlier version?

Yes. Going to older firmware version elimintatates this issue 100%. I just finished 7h print with 0 crashes. On current firmware version, same print crashed 6 times.

Posted : 17/01/2021 8:54 pm
mGoleta
(@mgoleta-2)
Eminent Member

@hooch

Which version doesn't have the problem?

Posted : 18/01/2021 12:20 am
Hooch
(@hooch)
Trusted Member

3.8

Posted : 18/01/2021 8:43 am
Hooch
(@hooch)
Trusted Member

Here is link to GitHub Issue: https://github.com/prusa3d/Prusa-Firmware/issues/2939
Looks like there are more people with this issues. And interesting note by one of them. It doesn't crash when using OctoPrint.

Posted : 18/01/2021 8:49 am
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