Y-Axis fake(?) Crash detections - let's debug  

RE: Y-Axis fake(?) Crash detections - let's debug

I had exactly the same symptoms as Gordon - reproducible crashes printing a simple circular model between 10mm & 15mm Z. Rebuilt Y-axis & greased the bearings, a small improvement in belt-text numbers but no change in Y-axis crashes. Prints were fine except for occasional zits from the nozzle moving to home & back during a crash. I printed a belt tension meter and its measurements showed the belt tensions to be fine. On the advice of Prusa support I swapped the X & Y motors and the problem went away. In my case I have simply made the swap permanent and so far, so good. Prusa have said that if I now get phantom X-axis crashes then they will send me a new stepper. I guess this is down to small differences in steppers & drivers such that sometimes a stepper/driver pairing is out of spec, but switching motors solves the issue.

RE: Y-Axis fake(?) Crash detections - let's debug

Hi, I had the same issues like the other guys. Some y-crashes seemingly without any reason...until my wife found that from time to time the y-bearings slightly touch the zipties that attach the ribbon cable (display) to the extrusions.

I sketched and printed 2 suitable clips and everything is fine now. I will publish the clips later today on printables.com

RE: Y-Axis fake(?) Crash detections - let's debug

The link in my last post is broken and I can't edit it.

Here is the working one:

RE: Y-Axis fake(?) Crash detections - let's debug

RE:

I'm truly finding this forum frustrating at the moment. Two detailed responses have now been lost with just blank posts appearing following moderation approval.  🤬 

I'll post this and if it appears, I'll edit it before the timeout - that edit timeout thing is a longstanding gripe that needs to get addressed too.

Ben.

RE: Y-Axis fake(?) Crash detections - let's debug

Hi Ben, 

This post still had content, when I came to approve it,

regards Joan

RE: Y-Axis fake(?) Crash detections - let's debug

This is a much shorter version of my previous attempts to provide detailed results on my testing, which have been lost due to issues with the forum.

I've moved my printer into a custom built enclosure.

All electronics, including the Einsy board, are now house in a separate, fan force cooled section.

Heatsinks have been installed on the stepper motor drivers.

The factory electronics box is too cramped with the excess wiring and has no room for heatsinks. Even if you could get it all in there, there would be insufficient airflow to allow any viable cooling to take place. That and the box is right next to the heat bed.

The ambient air temp in my print room regularly exceeds 35C.

Since doing the above, my false Y axis crashes have stopped.

IMHO opinion, the issues is directly related to heat. Whether this is specifically the effect of heat on the drivers, the CPU or a combination of both, I'm unsure.

Ben.

RE: Y-Axis fake(?) Crash detections - let's debug

After a week of testing, I can confirm that moving the electronics into a large and separate fan forced bay and installing heat sinks on the stepper drivers has not resolved the issue. 🙁   This basically rules out the heat theory for me.

I think I'll get a replacement Y axis motor as other have had success with swapping the Y axis motor out.

RE: Y-Axis fake(?) Crash detections - let's debug

Well, here we are at 3.14.0 and It is reporting Y axis crashes where nothing is visible.  Didn't have this problem before 3.13.3.  Has anybody figured this out?

RE: Y-Axis fake(?) Crash detections - let's debug

I'm also starting to see y axis crash/resume after updating to 3.14.0. Had never seen this on 3.13.3 and wonder why this is is happening?

RE: Y-Axis fake(?) Crash detections - let's debug

I wonder if it can it be a side effect from the new MBL functionality introduced in 3.14.0. I have changed mine from 3x3 to 7x7 to benefit from that?