M112 Called - Emergency Stop - Thermal Runaway Protection  

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

Tried to print again.  It was preheating and then this happened.  The filament was hot enough to boil on the hot end at which time I hit reset.  The heater block is getting hot, the temp reading is not working right it seems.  If the thermistor is good (kinda odd I'd have three go bad in a row), can the rambo be having issues?

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

This is a problem between the Prusa and Octoprint.  It is fixed in an upcoming firmware.  

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

@charles-h13

Thanks for the reply.  Do you know if there is a temporary fix?  Can I rollback my firmware?

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

@jurassic73

I did a hard reset and that sometimes fixes it.  What filament are you printing?

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

Posted by: @charles-h13

@jurassic73

I did a hard reset and that sometimes fixes it.  What filament are you printing?

hard reset = power cycle?  I have done this to no avail.  Thanks for the suggestion.

I am printing with the generic PLA profile in Prusa Slicer.  Odd thing is I printed a PETG item last night just fine, 30 minute print.  I did update to the latest firmware(3.9.1) now to try to troubleshoot but still having the same problem.

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

Saw this in the 3.9.1 notes but seems my attempt to run this firmware didn't help unless there's a compliment to this update in octoprint?

[quote]

Octoprint causing M112 fixed

The previous firmware versions sometimes incorrectly dropped some parts at the start of communication while connected over a serial line. This resulted in a scenario, where for example the Octoprint evaluated the printer as unavailable and sent G-code M112, which is a full emergency stop. More about the G-code M112 in our article at help.prusa3d.com.

This issue is now fixed and the printer communicates properly over the serial line.[/quote]

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

Odd that this dives after the temp change from 1st layer to 2nd...

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

@jurassic73

No, hold the selector down while power on.  That fixes it for a few days to weeks.  

I have had nearly no problems since uploading one printer to the new RC firmware.  It has nearly always been with PETG, ABS, and PC Blend.  I do nto understand it.  It never happens without printing from USB or SD card.  

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

@jurassic73

Are you sure you updated to 3.91 - that is the RC and not the active firmware.  

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

Posted by: @charles-h13

@jurassic73

No, hold the selector down while power on.  That fixes it for a few days to weeks.  

Ah - thanks and done.  Trying to print again now.

prusa3d_fw_MK3S_3_9_1-RC1_3512.hex is what I installed.

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

No dice.  Tried to slice and set all layers to same temp, pukes at layer change still.  Odd.

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

I tried.  It seems a few folsk are hevign this problem for different reasons.  I can't udnerstand it.

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

Posted by: @charles-h13

I tried.  It seems a few folsk are hevign this problem for different reasons.  I can't udnerstand it.

Thanks for your help.  Whittles down the troubleshooting 'logic'!

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

@jurassic73

True.  I must have been drunk typing that.  

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/prusa-slicer-pla-print-fan-speed-causes-thermal-runaway/

Interesting... about fan kicking on.  I had no issues printing PETG last night.  PLA today however has been a pain.

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

@jurassic73

Great info

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

So I think I'm getting somewhere... I turned the fan down to 76/255 via the control knob and the graph is relatively flat.  I did install this fan after my stock one started making a lot of noise.

https://www.amazon.com/FYSETC-Cooling-50x50x15mm-Radiator-Accessories/dp/B07NTKG9K4

Looks like it pulls more current than the stock MK3s blower fan which is .28A and this new fan pulls .35A so I assume just a more powerful fan.  Will see how this print turns out and if I need to see if my cooling shroud has any damage or the like with air leaking up into the thermal probe area.  I do have my block in a silicon sock already.

Curious if those spikes are due to the shape of the print sending air back up into the thermistor probe.

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

Please keep us updated.  

RE: M112 Called - Emergency Stop - Thermal Runaway Protection

Worked on this more last night.  Here's a video of the temp fluctuations.

I even witnessed the temp fluctuation during bed leveling.  Stayed at 225/210 for a bit.

I had fired up a print, let it get to layer two when the cooling fan turns on to see fluctuations in temp, then turned the fan speed down from 255/255 to 100/255 and temps leveled out at 210 for a few minutes then went wonky again jumping around.

I find it hard to believe that three thermistors in a row would go bad in short time.

This all started after I swapped out my cooling fan.  This cooling fan is sold on a number of sites as a replacement for the stock blower fan.  I can't imagine jumping up from a fan that uses .28A to one that uses .35A would cause issues even since I slowed the fan speed and this happens.

When I install a new thermistor, things are good for a while then eventually get like they are now.

Is there a way to debug the Rambo unit?