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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!?

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    $\begingroup$ Have you PID tuned the heated bed? $\endgroup$
    – 0scar
    May 7 '19 at 10:58
  • $\begingroup$ aside note: as an upgrade you can add an insulation under your HB to keep the temperature more constant $\endgroup$ May 7 '19 at 11:32
  • $\begingroup$ @0scar No, I'm using the default pid parameters. I Thought it would mess it up if I changed them. $\endgroup$
    – 2012User
    May 7 '19 at 11:48
  • $\begingroup$ @ darth pixel , I'm using an insulator, however it doesn't cover all the surface beneath HB. $\endgroup$
    – 2012User
    May 7 '19 at 11:49
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    $\begingroup$ First thing to do is do a PID tuning session! :) $\endgroup$
    – 0scar
    May 7 '19 at 11:57
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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.

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    $\begingroup$ Thank you. Since I did a pid tuning session everything is good. $\endgroup$
    – 2012User
    Jun 2 '19 at 7:18

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