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Heatbed-problems after PID-calibration  

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Scrypto
(@scrypto)
New Member
Heatbed-problems after PID-calibration

Ok first of, there is my EEPROM-Code in the picture since the copypaste funktion sucks.

First up I have an old printer with the latest software (3.2.3). It's a Prusa i3 MK2s and about 5 years old.

About a year ago I resoldered the wiring to the heatbed because the cables broke.

I also changed the copper wires to the thermistor while I was at it, since it looked really dire. Afterwards it worked perfect for about a year.

Now I got the "Bed Thermal Runaway" Error randomly after an uncertain printing time.

On reddit I got the suggestion to recalibrate my pid-values which was a good idea since I never did it. I followed the manual on snazzyit com/pid-calibration-for-prusa-i3-mk2s-mk3-3d-printer

It worked and the new values are in the EEPROM.

But, now I start a new print and at the end of the mesh bed leveling the red light on the heatbed turns off and the bed can't be heatet up anymore. Of curse the print continues but the same Thermal Runaway Error will come up.

Basically I can't print at all now. Only a restart will let me heat it up again.

Does anybody have an idea what could help this? I'm at the end of my nerves and have no idea what to do next.

This topic was modified 1 year ago by Scrypto
Posted : 01/03/2023 9:37 am
emmafrost1
(@emmafrost1)
Member
RE: Heatbed-problems after PID-calibration

 

Posted by: @scrypto

Ok first of, there is my EEPROM-Code in the picture since the copypaste funktion sucks.

First up I have an old printer with the latest software (3.2.3). It's a Prusa i3 MK2s and about 5 years old.

About a year ago I resoldered the wiring to the heatbed because the cables broke.

I also changed the copper wires to the thermistor while I was at it, since it looked really dire. Afterwards it worked perfect for about a year.

Now I got the "Bed Thermal Runaway" Error randomly after an uncertain printing time.

On reddit I got the suggestion to recalibrate my pid-values which was a good idea since I never did it. I followed the manual on snazzyit com/pid-calibration-for-prusa-i3-mk2s-mk3-3d-printer

It worked and the new values are in the EEPROM.

But, now I start a new print and at the end of the mesh bed leveling the red light on the heatbed turns off and the bed can't be heatet up anymore. Of curse the print continues but the same Thermal Runaway Error will come up.

Basically I can't print at all now. Only a restart will let me heat it up again.

Does anybody have an idea what could help this? I'm at the end of my nerves and have no idea what to do next.

Here are a few suggestions that may help you resolve the issue:

Check the wiring: Since you resoldered the wiring to the heatbed, it's worth double-checking the connections to ensure they are secure and properly insulated. Loose or faulty wiring could cause intermittent issues with heating.

Inspect the heatbed thermistor: Verify that the thermistor is securely connected and that the wires are not damaged or frayed. Sometimes, a loose or damaged thermistor connection can cause temperature fluctuations, triggering thermal runaway errors.

Insulation and cable management: Ensure that the wiring is properly managed and insulated to prevent any short circuits or accidental disconnections. Cable ties and heat-resistant insulation materials can be used to organize and protect the wires.

PID tuning: You mentioned that you followed a PID calibration guide, which is a good step. However, if the issue persists after calibrating the PID values, it's possible that the new values may not be optimal for your specific setup. You can try experimenting with different PID values or even revert to the default values to see if it makes a difference.

Firmware update: Check if there are any firmware updates available for your printer. Upgrading to the latest firmware version can sometimes address bugs or compatibility issues that may be causing the problem.

Contact manufacturer or support: If you've exhausted all troubleshooting steps and the issue still persists, it might be helpful to reach out to the manufacturer's customer support or consult the printer's user community. They may have encountered similar issues and can provide specific guidance for your printer model.

Remember to exercise caution when working with electrical components, and if you're unsure about any step, it's best to seek professional assistance.

Posted : 12/05/2023 10:31 am
hsbowen
(@hsbowen)
Member
RE: Heatbed-problems after PID-calibration

Did you ever resolve this? I have a somewhat similar issue. I also soldered heatbed wires directly to the back of the board. This worked for a couple of years. Continuity & resistance confirmed from bed to board. I randomly measure either 2V or 6V at the board terminals (with leads to heater bed desoldered). I see 12V atboth pairs of power supply terminals to the board.

Posted : 29/05/2024 7:23 pm
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