Thermal ruaway when changing nozzle  

RE: Thermal ruaway when changing nozzle

It has nothing to do with the slicer.  Is has everything to do with the printer firmware.  

RE:

@neophyl Yes, I think you are correct. I updated the firmware at the same time as the slicer update, and it makes sense that the firmware is the 'cause' of the problem. Are there any workarounds?

RE: Thermal ruaway when changing nozzle

Downgrade the firmware is about the only option.

RE: Thermal ruaway when changing nozzle

btw theres an open request for a firmware change for this https://github.com/prusa3d/Prusa-Firmware/issues/4189   

RE:

You can also use the new option in the hardware menu for nozzle changes. It disables the TM during a nozzle swap. 

edit: Hardware menu on the LCD screen. 

RE: Thermal ruaway when changing nozzle

Thanks fuchsr.  I'm not running any of the new firmware on mine.  Given all the troubles its gone through and that I don't need any of the new stuff I just couldn't see a reason to install something so buggy.  I'm sticking with what works.   I'm glad you are keeping up with it and testing it for us though 🙂

RE: Thermal ruaway when changing nozzle

This new thermal model has been a bizarre experience. No issues on Mk4 and XL, so far. On my minis, both having dragon hotends and TC nozzles, one is fine, the other I can't start without getting a TM error but if I preheat to 180 and then load filament it'll print with no issues until I shut it down, regardless of how often I let it cool down and heat up again. My MK3s both are fine, despite having Dragon hotends and TC nozzles.

From all the problem reports, I don't know, something just feels fundamentally broken with their thermal model implementation. While I applaud their effort to add more safety features, how many Prusas have gone up in flames? But clearly a lot of of perfectly fine working printers have become unusable (or require downgrading the firmware).