Thermal calibration fails 3.12.2  

RE: Thermal calibration fails 3.12.2

I've been underwhelmed with the whole thermal model. I'm all for improving safety but too many perfectly fine working printers seem to get disabled with a model that appears to be too zealous.  The Mk3S - unlike the Mini - at least has a way to disable it. Please check the release notes for the gcode you need to send to disable it. 

RE: Thermal calibration fails 3.12.2

Here's the instructions they're giving folks submitting bugs on GitHub.

You can disable the thermal model by sending G-code

M310 S0

followed by

M500

to make it permanent.

RE: Thermal calibration fails 3.12.2

Thanks for the replies. I decided to downgrade to 3.11 and I'm back to happy printing.

I'll wait for the thermal model to mature a bit more before upgrading. I've been able to rely on firmware updates to be flawless up to now. I guess they're trying something with good intentions but rolling it out before it's ready.

RE: Thermal calibration fails 3.12.2

I upgraded to Revo at the same time as 3.12.2 because it "supposedly" solves Revo problems. Thermal calibration ran maybe 5 seconds before an error.  Downgraded to 3.11 and all works fine.  Revo definitely heats faster than stock.

You know, if they are going to release 3.12.2 as BETA, it should say BETA.  This software is definitely not ready for prime time.  

RE: Thermal calibration fails 3.12.2

I've got a Mosquito and I dropped back to 3.11. It's stable and it works.

There's another problem too, that I hope isn't unique to me, but it's that the M112 error now sounds a continuous alarm. As in, it doesn't go away until you acknowledge it. I only get these when my printer is idle and at room temp, so you can imagine how fun it is to be woken up early in the morning to hear this sound.

I just hope they can sort out this firmware to work in the future.

RE: Thermal calibration fails 3.12.2

I just upgraded to 3.12.2 and I am unable to complete thermal calibration. Hotend is the Revo 6

RE: Thermal calibration fails 3.12.2

I suggest that you downgrade to 3.11 and wait for a revo proof version of the new firmware

regards Joan

RE: Thermal calibration fails 3.12.2

it's not just about being Revo proof. But wasn't the whole concept of Prusa an open source printer? This thermal model protection is locking people into specific hardware unless they disable it through gcode commands. this feature is an alpha at best. And if it's only going to work on specific hardware, rather than working like PID tuning, where it tunes to the hardware, then there should be a menu setting to disable it, not through gcode. 

RE:

Posted by: @sg-newb-rider

it's not just about being Revo proof. But wasn't the whole concept of Prusa an open source printer? This thermal model protection is locking people into specific hardware unless they disable it through gcode commands. this feature is an alpha at best. And if it's only going to work on specific hardware, rather than working like PID tuning, where it tunes to the hardware, then there should be a menu setting to disable it, not through gcode. 

I agree.  And even more, this is not some random hotend from some unknown company. This is an upgrade hotend made by the company that has been suppling hotends for "stock" PRUSA 3D printers for years.  You would THINK, if PRUSA was going to modify the FW that would BREAK the REVO, they would have the courtesy to work with E3D to get it working BEFORE this firmware was even released.  The fact that they didn't tells you a lot about where PRUSA is now.

And nobody has yet to tell me what this firmware achieves.  Why was it SOOO important to release?  

RE: Thermal calibration fails 3.12.2

And nobody has yet to tell me what this firmware achieves.  Why was it SOOO important to release?  

That's a very valid question. 

RE: Thermal calibration fails 3.12.2

I have been using the Revo nozzles without any problems (multiple sizes) for several months without problems. As soon as I flashed 3.12.2, I had the same failed thermal calibration issue! Tried entering the G-codes suggested by @extra-fox. Those seemed to make the fan run at 100% all the time. So back to 3.11 and all is working just fine again. If you have a Revo nozzle, I DO NOT recommend upgrading to 3.12.2. Not sure about the other 3.12.x releases as I didn't install them. Now if I could just get rid of the annoying message on the LCD to upgrade to 3.12.2!

RE: Thermal calibration fails 3.12.2

look in the 
Printer Settings       Custom Gcode,   Start Gcode

there should be a line, something like this 

M115 U3.12.2 ; tell printer latest fw version

Delete this line
and save the profile as a new name

say 

Original Prusa i3 MK3S & MK3S+ - No Firmware Nag

Then use that profile in the future. ~

Regards Joan

RE: Thermal calibration fails 3.12.2

Thanks Joan.  I did figure that part out.  

But maybe the bigger question? Why did Prusa suddenly feel the need to release firmware for a 5 year-old printer that breaks a very popular third-party upgrade (Revo) coincedentily at the same time Prusa just happens to be releasing their own competitive upgrade in the form of a MK4 "upgrade" kit.  Now you might say, Prusa wants the firmware to work with their upgrade, and that is fine.  But if you DON'T have their MK4 upgrade, they should deactivate the part of their firmware that breaks Revo.  Otherwise, to me, it looks very petty and self-serving.  

RE: Thermal calibration fails 3.12.2

Prusa has a good record, I'm sure they will fix it. What you are saying is a bit of a conspiracy theory.

RE: Thermal calibration fails 3.12.2

I recently upgraded to 3.12.2 as well and have made more print failures than ever before.  The last one completely fouled my extruder.  No biggie, I will just install my Revo 6 that I have been sitting on for the last two weeks.  So now I am not even at the custom G-Code stage yet.  I can't even try and load filament into the Revo 6 because I immediately get an error about temperature anomalies.  So I try to a PID calibration but it seems to do the same thing most others are saying.  It jumps up to 35C and then shuts off the heater.  This is where it stays.  It is stuck on step 0 of 5.

Now what?  Go back to 3.11 and do the PID calibration there?  What's the consensus?

RE: Thermal calibration fails 3.12.2

that's twice now... thermal fails with my revo... getting rather sick of this crap

RE: Thermal calibration fails 3.12.2

I went back to firmware 3.11 and the revo works with it. Good enough for me! 🙂

RE: Thermal calibration fails 3.12.2

Yeah, coincidently Prusa now has their own quick-change hotend, so they "upgraded" their firmware so the competitor product no longer works.  But don't fear they are "working" on fixing it. 

RE: Thermal calibration fails 3.12.2

Yes, "they upgraded" their open source firmware and "forced you to install it", right. 🙂

The revo works just fine with firmware 3.11 that the upgrade instructions by e3d tell you to use right at the top.