Thermal anomaly  

RE: Thermal anomaly

Now I get a nozzle is different than g code

Which nozzle diameter is installed in your hotend? 0.4 or 0.6 or anything else?

There is a menu   "Settings > HW Setup > nozzle d"  where you can tell the printer which nozzle is installed. Make sure it matches with the installed nozzle.

Then make sure in the slicer you use the correct nozzle diameter in printer settings and everything should work...

RE: Thermal anomaly

This is the Mk3s  kit and it came with a .4 nozzle.  I have only used this one.

RE: Thermal anomaly

I checked settings and .4 was there.

RE: Thermal anomaly

Then the only thing that could still be wrong is you set the wrong nozzle diameter in slicer...

RE: Thermal anomaly

Lokin at the slicer it shows .4.  I guess that is mm.  Later on it shows .25 so that must be inch.

RE:

The answer is here https://github.com/prusa3d/Prusa-Firmware/releases

It's nothing to do with the slicer, it's the firmware. Presumably you have an after market hot end; something like a Revo? (That was my problem)

RE: Thermal anomaly .

All stock, even the upgrade

It could be a coincidence.  Nozzles don't last forever and if you've been using yours for years ... mine last 6 - 9 months.

Cheerio,

RE: Thermal anomaly

I have stock MKS3+ (nothing was changed in it). It worked fine for over a year. Now, immediately after upgrading to 3.12.2, my prints are now failing after couple of hours of printing with "Paused, thermal anomaly". When trying to restart print it heats up the nozzle - I can see it on the screen, start moving print head and within fraction of the second fails without even restarting the print with "thermal error" message wasting all the half printed parts. I'm suspecting software but just to be sure  just ordered hot end thermistor, waiting for it to arrive. If that will not fix the issue I will try downgrading to 3.11 and see what happens.

RE:

Same here. Entirely stock presseembled MK3S+, 8 months old. Now failing with thermal error, thermal anomaly, and so on, running 3.12.2. I have recalibrated and no luck. Also getting a lot of YX collisions due to filament bunching up and rising a tad, enough to hit the nozzle. 

Was never an issue prior to 3.12.2. 

RE:

Was there a fix found for this? I hadn't printed in a while and just started getting this error. All stock like others, just can't print due to anomaly message after update.

RE: Thermal anomaly

Hi thereSo yesterday, i finished a short (1h) print in petg, and after, i unloaded the filament. Everything ok until now.

Today, i loaded the same petg spool. however, once i started a new print, i was hit with the Thermal anomaly error.

i tried a Temperature model calibration, but error appeared again.

My firmware version is 3.12.1.Could it be that the thermistor and/or the heater have gone bad?

RE:

Having the same issue as others here. I have 2 stock mk3s+ and after the latest firmware update I'm getting a crazy amount of thermal anomalies and one of the machines will randomly change it's target temp to 0 in the middle of the print causing the print to fail. I changed one of the machines back to the previous firmware and the thermal anomalies continue to happen. So I swapped in a new thermistor and heater cartridge just to be sure. Nope, thermal anomalies still happening.

RE: Thermal anomaly

Posted by: @cwcdesigns

Having the same issue as others here. I have 2 stock mk3s+ and after the latest firmware update I'm getting a crazy amount of thermal anomalies and one of the machines will randomly change it's target temp to 0 in the middle of the print causing the print to fail. I changed one of the machines back to the previous firmware and the thermal anomalies continue to happen. So I swapped in a new thermistor and heater cartridge just to be sure. Nope, thermal anomalies still happening.

I went back to 3.11 and now I'm having thermal runaway messages. I wrote Prusa directly last night to see if they have any input.

I have a few theories but need some input from them before I start replacing parts again. I spent over an hour just trying to get the first layer calibration corrected (couldn't do it). I'm wondering if the upgraded firmware actually damaged something on mine. I noticed late last night while continuing to troubleshoot that my cooling fan comes on for a second at startup but won't turn on during a print.

RE: Thermal anomaly

Posted by: @jamessmall

 

Posted by: @cwcdesigns

Having the same issue as others here. I have 2 stock mk3s+ and after the latest firmware update I'm getting a crazy amount of thermal anomalies and one of the machines will randomly change it's target temp to 0 in the middle of the print causing the print to fail. I changed one of the machines back to the previous firmware and the thermal anomalies continue to happen. So I swapped in a new thermistor and heater cartridge just to be sure. Nope, thermal anomalies still happening.

 

I went back to 3.11 and now I'm having thermal runaway messages. I wrote Prusa directly last night to see if they have any input.

I have a few theories but need some input from them before I start replacing parts again. I spent over an hour just trying to get the first layer calibration corrected (couldn't do it). I'm wondering if the upgraded firmware actually damaged something on mine. I noticed late last night while continuing to troubleshoot that my cooling fan comes on for a second at startup but won't turn on during a print.

Ok so I'm 2 days in after doing a full factory reset as well as the older firmware and I haven't had an issue yet. If this holds up for a few more days I'm going to do it to the rest of my machines.

RE: Thermal anomaly

In my case replacing hot end thermistor and recalibrating solved the issue. It is possible that just recalibrating would do the trick, but my thermal anomaly was occurring several hours into the print basically wasting a lot of plastic and I did not had a heart to experiment. The online search was pointing to thermistor as the most probable cause and it is relatively inexpensive ($9) part to replace.

RE: Thermal anomaly

I experienced something similar.
My original hotend broke and i replaced it with a cheap alternative from amazon as the original hotend was not available from prusa.
It worked for some weeks and suddenly during one print it stated "thermal runaway" and stopped the print.
Since than it would not heat the hotend anymore.
Not manually on preheat and no print would start.
I just upgraded the printer firmware to the lastet verison, but the problem persists.

The 3 replaceable fuses on the PCB measure ok, the cable to the heat tube is also conductive from the connector to the end.
I had one more spare heatelement, exchanged that, but this is not getting hot either?!
I am out of ideas.

I hope posting this here as a reply is the correct way, i never used this forum before and this topic seems very much related.

RE: Thermal anomaly - FIXED

I*think* i found the error.
The ceramic element for heating seems to be broken.
The original part can be measured for electricical continuity and it is like a piece of wire.

so connecting both ends to the beeper of the multimeter will beep if it is ok.
In my case BOTH cermamic hotend elements were broken.

I ordered replacement parts from amazon as prusa still does not ship those parts from the shop 🙁

RE: Thermal anomaly

We are having Thermal Anomaly and Thermal Error problems as well. We have two stock pre-assembled MK3S+ that have been working great all year but now one of them cannot run Thermal Model Calibration or even unload filament without a Thermal Anomaly/Error.  We upgraded both machines firmware a month or so ago but only one of them is having a Thermal problem. At first we thought it was because the air conditioning was blowing air on/near it but we have no idea if that would actually cause an issue.

From what Im reading I think order of operations of things we will try are: Factory Reset and downgraded firmware first, and if that doesnt work, replacing thermistor and heater cartridge? Anything else to try?