RE: Y-Axis fake(?) Crash detections - let's debug
This is beyond frustrating...
What are the Numbers on your Belt-Tension (Menu -> Support -> Belt Status)
X = 273
Y = 258
I'd be worried about the Y=258 number. It means you have above average friction on the Y axis. Have you backed off the U-bolts clamping the bearings to the sled?
RE: Y-Axis fake(?) Crash detections - let's debug
This is beyond frustrating...
As tim-m30 mentioned. Try reset those bearings on that two rods. Give them oil and check the rods if any cut on they sides. (by the bearings balls)
When i done with that at 07.07, the Y crash never again happened.
RE: Y-Axis fake(?) Crash detections - let's debug
I did. I actually followed on of the recommendations of a builder who commented in the manual who put a piece of paper under the edge of the nylon nut and tightened until he just couldn't get the paper out easily, then loosened to get the paper out then re-tightened to the same amount on all 6 nuts. The extra quarter turn recommended was a bit too tight.
RE: Y-Axis fake(?) Crash detections - let's debug
I have oiled all the bearings using Super Lube, as recommended. Alas, they never included any lube in my kit and had to buy my own. But I have to do a closer inspection for scratching/catching. I can move the bed smoothly without any catches but I guess I need to take the bed apart and do a visual inspection. Just so frustrating that it was working perfectly for the first couple weeks and now this. I did a few prints on stealth mode and every print came out great. My layers actually look better than they do on Normal mode. Will post again with visual inspection results.
RE: Y-Axis fake(?) Crash detections - let's debug
The Prusa articles says anything above 240 is ok. Does this mean the lower the number, the higher the friction?
RE: Y-Axis fake(?) Crash detections - let's debug
You may have crushed a bearing... and that is permanent. Do another self test and report the new belt numbers.
RE: Y-Axis fake(?) Crash detections - let's debug
I made no adjustments. I had already lubricated the heck out of every rod, bearing and Z-Axis screws when the problem first started.
I did another self test this morning and it reported "OK"
Belt Status:
X-Axis = 281
Y-Axis = 262
I ran the last few prints I did in stealth mode and no X-Axis shifts on any prints. Will retry on some calibration cubes on Normal mode and report back.
I used digital calipers to measure a few prior prints and the X-Axis shifting appears to happen all at 5.10 mm. This is somewhere around the 25th layer as most of my prints have been at the 0.2 mm layer height. I cannot say I tested to see if this happens at any specific layer setting in the slicer, but I cannot imagine this would make a difference. I have looked all around the Axes and especially around the X-Axis around this height to check for anything that could be abutting the movement of the extruder and plate and there is nothing hitting it. I have built plenty of PCs in the past and my wiring is all tucked away and nothing strikes a moving part through the full range on motion of all the Axes.
I read some folk had the same issue happening above and some thought the firmware was the problem. I don't believe this is the case as it worked well when I first completed the build and even after the latest firmware update the first several prints turned out great. I added a RasPi Zero and have been happily printing with OctoPrint Prusa edition for several prints before the issue started, so I'm at a loss.
Even a crushed bearing should leave a gouge or scratch mark on the rods or the bed should not move smoothly. Mine moves smoothly and no findings of damage all around the rods. I don't even see any shifting of the bearing from the central position on the bed, even after all the ramming the self test does, so I guess my U-bolts are just tight enough.
I'm happy to print in stealth mode but I hate that the printer isn't working as it should. Any thoughts on the new self test results or other troubleshooting I could do?
RE: Y-Axis fake(?) Crash detections - let's debug
I recently spoke to chat and they were aware of an issue with false crashes in 3.7.2, to be fixed in 3.8.
RE: Y-Axis fake(?) Crash detections - let's debug
Wow, thanks for the reply. This frustrated me to no end. This is my first 3D printer but I followed the manual very closely and the first couple weeks of prints were amazing. Did the chat person indicate that the issue would go away when on Stealth mode? That is what is happening for me. I'll just keep it on Stealth for now until they get this worked out.
Happy Printing.
RE: Y-Axis fake(?) Crash detections - let's debug
Wow, thanks for the reply. This frustrated me to no end. This is my first 3D printer but I followed the manual very closely and the first couple weeks of prints were amazing. Did the chat person indicate that the issue would go away when on Stealth mode? That is what is happening for me. I'll just keep it on Stealth for now until they get this worked out.
Happy Printing.
Crash detection is disabled in stealth mode.
RE: Y-Axis fake(?) Crash detections - let's debug
Kit or Pre-Assembled?
[X] Kit / Pre-Assembled [ ]
Firware
3.7.2-2370
What Slicers did you use / did it make a difference?
[X] Prusa Slicer
[X] Cura 4.2
[X] Pre-Sliced SD
No difference imo
What are the Numbers on your Belt-Tension (Menu -> Support -> Belt Status)
X = 290
Y = 253
Which Version of the Y-axis Assembly / Heatbed Assembly do you have?
New version prusa MK3S - aug 2019
Only Y-Axis or also other crashes? (look it up in the fail stats -> Total)
Only Y
So what i have done so far, i took apart the entire Y axis assembly and rebuild it again, with some tips from this thread i checked everything and lubed the axes, even checked the wiring, everything mechanically is running smooth so my thought is that this fake Y crash is a bug or smth, because if i slow the print speed to 95 % the crashes don't occur so often...
RE: Y-Axis fake(?) Crash detections - let's debug
Kit or Pre-Assembled?
[X] Kit / Pre-Assembled [ ]
Firware
3.7.2-2370
What Slicers did you use / did it make a difference?
[X] Prusa Slicer
[X] Pre-Sliced SD
No difference imo
What are the Numbers on your Belt-Tension (Menu -> Support -> Belt Status)
X = 276
Y = 279
Which Version of the Y-axis Assembly / Heatbed Assembly do you have?
New version prusa MK3S - May 2019
Only Y-Axis or also other crashes? (look it up in the fail stats -> Total)
Only Y - 82
RE: Y-Axis fake(?) Crash detections - let's debug
I upgraded to 3.8.0 and now the problem is even worse 🙁
RE: Y-Axis fake(?) Crash detections - let's debug
I upgraded to 3.8.0 and now the problem is even worse 🙁
What are your settings and tension number looking like majorbzzn? "Doesn't work" isn't very helpful for diagnosis.
RE: Y-Axis fake(?) Crash detections - let's debug
@tim-m30
Kit or Pre-Assembled?
[X] Kit / Pre-Assembled [ ]
Firware
3.8.0 - 2684
What Slicers did you use / did it make a difference?
[X] Prusa Slicer 2.1.0
What are the Numbers on your Belt-Tension (Menu -> Support -> Belt Status)
X = 257
Y = 274
Which Version of the Y-axis Assembly / Heatbed Assembly do you have?
New version prusa MK3S - May 2019
Only Y-Axis or also other crashes? (look it up in the fail stats -> Total)
Only Y - 33
RE: Y-Axis fake(?) Crash detections - let's debug
Last print accounts to 22/33 Y axis crashes (this is the only print after upgrading to 3.8.0) and it was 3 hours long which is the average time of all my prints.
RE: Y-Axis fake(?) Crash detections - let's debug
@majorzbzzn
Hello!
1- Please can you inspect the Y axis rods? Maybe you got markings on it from the bearings.
2- Did you used the same bearings all the time at the reassembly too? If yes, maybe your bearings are damaged and thats why the Y crash still on board.
When i rebuilt my Y axis i used the U bolts again and same bearings. Its worked fine for months, but Y crash appeared again at large objects.
So i printed out some Y axis bearing holder from thingivers and its working great! (I ordered a new sets of bearings and rods too)
Give it a shoot. I think its not a software problem.
RE: Y-Axis fake(?) Crash detections - let's debug
@attila-gerebi
The printer is brand new (~30 hours of print) and there are no markings on the Y-rod.
I disabled the crash detection and there is no issues printing the same model that generated 22 crashes before.
Could it be that the PINDA sensor hits the model? Would that be considered as Y crash?
It is hard to tell but since the head has some up-down motion when printing a single layer I guess it could be possible.
Does anyone know what Y crash actually mean?
Thanks,
Boris
RE: Y-Axis fake(?) Crash detections - let's debug
A crash means the motor driver electronics have detected an over-current event that indicates the stepper motor has stalled.
You don't need scored rods to have bearings that have too much friction. Here's an easy friction test:
Turn the printer off. Pull the bed forward so it is at the front of the printer. Raise the front of the printer until the bed begins to slide to the back under gravity alone; hold the printer steady as the bed slides.
How high did you need to lift the front? Did the bed stutter or stick along the way? It should slide smoothly and evenly with no sticking or stopping along the way. You can do the same test for X, but usually that takes a bit more of an angle.
RE: Y-Axis fake(?) Crash detections - let's debug
@tim-m30
I did the test and you are right. There is a spot about 80% down the way where the bed gets stuck. If I give it a very light push it continues as normal. If we assume that this is indicative to the problem. What can I do to resolve it?