How to decrease sensitivity to heat-bed temperature?


Sometimes I use a DIY 3D printer running Marlin firmware and I have a hard time to set my heat bed temperature. when I set it to 70 °C for PLA, after a few minutes it decreases to 67 °C and I see these error:

READ: Error:Thermal Runaway, system stopped! Heater_ID: bed
READ: Error:Printer halted. kill() called!

Since then the communication with printer is lost, the printing process stops and I have to reconnect to serial port... It's a disaster. I guess I need to lower the sensitivity to 3 degrees at least. I don't know how!?


Posted 2019-05-07T10:34:34.253

Reputation: 521

2Have you PID tuned the heated bed? – 0scar – 2019-05-07T10:58:15.393

aside note: as an upgrade you can add an insulation under your HB to keep the temperature more constant – darth pixel – 2019-05-07T11:32:26.690

@0scar No, I'm using the default pid parameters. I Thought it would mess it up if I changed them. – 2012User – 2019-05-07T11:48:14.403

@ darth pixel , I'm using an insulator, however it doesn't cover all the surface beneath HB. – 2012User – 2019-05-07T11:49:55.720

2First thing to do is do a PID tuning session! :) – 0scar – 2019-05-07T11:57:16.620



I had a similar issue when printing with ABS, because my print cooling fan only activated once it got to a certain height above the bed. I'd say you need to do a PID tuning session, insulate the bottom of the bed better, and see if you can make sure your cooling fan doesn't blow air over the bed itself.


Posted 2019-05-07T10:34:34.253

Reputation: 826

1Thank you. Since I did a pid tuning session everything is good. – 2012User – 2019-06-02T07:18:31.760