Flashforge Creator Pro Thermocouple Reader Fault

General Discussion
1

Basic Information:

Printer Model: Flashforge Creator Pro
MCU / Printerboard: Flashforge Board Rev D (Mightyboard Clone)
Host / SBC: Raspberry Pi 3 Model B
klippy.log attached
klippy.log.2024-07-12.zip (238.6 KB)

General Info:

Hey everyone, thanks in advance for your help. I am trying to give my FFCP a 2nd life and was very excited to have found Klipper and see that there was a FFCP profile in the config examples. I managed to install the firmware and get everything up running using the mainsail/klipper image on the Raspberry Pi Imager. I am able to communicate with the printer, control motion and set temps manually. So the next step was my first print…

Describe your issue:

When I load the gcode and start the print, the heat bed gets to temperature, then the extruder starts heating, immediately after the extruder gets to temp, klipper goes into a shutdown state which can be seen in the logs. I am seeing “MCU ‘mcu’ shutdown: Thermocouple reader fault” but I can’t seem to find any info on what caused the fault, or which thermocouple it was.

I have a few theories. Maybe you can confirm or suggest other ideas. I understand that FFCP may have been changed a few times over the years, is it possible that the sensor_type may not match what’s in the default klipper FFCP config? Orca Slicer set the default ABS temp to 260C, which I thought was abit high, and I see that the klipper FFCP profile has a max temp of 260C. Is there some tolerance that may be being exceeded having the temp set at the maximum?

Thanks for any help!

2

Ok, the issue was the print temp being too close to the max temp. I reduced the print temp and it looks like it moves to the next step of starting the print, but now it’s not extruding.

Hopefully this helps someone.

On to the next issue.

3

Tough question.

Since you are getting reading, your settings seem correct. Unfortunately, thermocouples and their controlling chips (MAXxxx) can be a pain in the back:
They are extremely sensitive to all sorts of interferences, e.g. ground loops etc.

  • Carefully check your wirinng. A slight pre-damage may cause failure when hot hot or moving
  • Avoid max_temp = 260 when you intend to heat up to 260°C. You need some head-room, e.g. max_temp = 270
  • Might be a defect / dying sensor
4

Thank you so much for your response. I ran some tests and confirmed this is the issue. Set the extruder heat to 230C and I was able to avoid this shutdown.

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