[BUG] Thermal Anomoly errors in 3.14.0

[ezekeal]

Printer type - MK3S+
Printer firmware version - 3.14.0

MMU upgrade - none
MMU upgrade firmware version - none

SD card or USB/Octoprint
sd card

Describe the bug
After updating to firmware 3.14.0 I am getting thermal anomaly errors during calibration.
Previously the printer was working without issue.
All stock parts no upgrades

To Reproduce
Walk through calibration wizard
anomoly happens on first layer calibration

Expected behavior
No thermal anomaly errors

[ezekeal]

It's clear from the forums that this thermal model code has never worked well. What is really needed is a way to disable it.

[Prusa-Support]

I'm sorry to hear that, and I understand the problem may look like a direct consequence of the firmware upgrade but there haven't been similar reports since 3.14.0 was released - not that I know, so far - so it may be an unfortunate coincidence, or you may come from an old/custom firmware without Thermal Model.

We may be missing something but so far this seems to be an unfortunate coincidence, so please contact our Customer Support to check the hardware, and I strongly recommend not to take the thermal anomaly lightly! Other than this, there is a way to disable it via codes of course - #3552 - but that is definitely not advisable.

Some users may have decided to ignore the thermal anomalies, and we respect their opinion on forums, but there haven't really been comments and evidence to prove the thermal model wrong.
We do have studies carried over not less than 150k measurements to tell otherwise 😉

If you say that it has never worked well, it may seem to imply you have been ignoring an even mildly potentially hazardous condition for a long time, or you may have been using an underperforming printer (to some extent).
Again, please have this sorted out once and for all with the help of our Customer Support but if you decide to ignore the warning and disable the thermal model, you would do it at your own risk.

Except for multiple new reports over the next few days/weeks, this issue should be closed as we are probably looking at the correct firmware behavior caused by more or less concerning - yet real - hardware issues, or assembly inconsistencies.

Michele Moramarco
Prusa Research

[donslice]

+1 for the thermal anomaly here.
MK3S, newly upgraded to 3.1.04 today. It was previously working with no issues before upgrading.

[kgrab75]

Same for me.

I don't know if it comes from there, but I launch my prints from Pronterface.

[bradtho]

I have replicated the issue on my MK3S+. However I have a Revo Six Hotend

My last working "native" version of Firmware is 3.11.0. The issue was introduced with 3.12.0 with the addition of the "New thermal model protection" feature.

There is a discussion #4451 that goes into detail and has allowed me to move to 3.14.0 🤞🏻

[GaborTheHutt]

Same problem here.

[dingo1984]

i did buy my machine second hand had no issue does have a nozzle upgrade. soon as i upgraded to 3.14.0 i've had the thermal anomaly. and wont calibrate. im now running back on 3.10.0

[GaborTheHutt]

I did a factory reset after and before flashing 3.14 and then the thermal anomaly error appeared immediately.
Gone back to 3.11 for now.

[cpuks]

Same here on mk3s+ with revo and bondtech extruder, sometimes thermal error persist but hotend warms up without issues, sometimes with same error on display warm up stops and I have to clear error.

[bradtho]

@GaborTheHutt, @dingo1984 and @cpuks - Are you using the standard 3.14 image or the special Revo 3.14 image? The discussion in #4451 goes into detail on how to install it.

[cpuks]

Since I've got bondtech extruder I'm using their version and it's special one for revo - and it's displayed on the screen. So well I think I'll have to go back to 3.11 as turning off thermal model does not work in my case.

[3d-gussner]

as turning off thermal model does not work in my case.
@cpuks What do you mean that turning off Thermal model doesn't work?

You can connect via USB and open a serial monitor and look which TM errors you get.
Can you share your log file of the issue you describe?

I get sometime TM warnings when heating up after a print has finished and I start a new print, BUT never got a TM error that I had to clear. On the other hand I have the stock E3Dv6.

Try to change your W and E values to bit higher values to prevent TM errors that need to be cleared.
Please do not forget that changing the settings with M310 are only active until you reset or power off the printer.
To save your settings permanent you need to use M500.

I can understand some user being frustrated that TM triggers on some REVO to sensitive and what to disable it. But there have been more than one case I know off where a broken wire was detected and so prevented a way bigger issue.

[dingo1984]

i not sure as i didnt ask when i bought it i have flashed again to 3.14 still getting the anomaly i clear tm fault and retry first layer calibration. i do this several time until i reach around 160c alarms but keep going to right temp but now filament sensor not working

[dingo1984]

filament my fault sort but still getting thermal anomaly. managed to get it to do the first layer cal, but thats with constantly clearly thats thermal fault until i get to about 160c