Marlin 2.0.7.2 - Printer Stops with "Thermal Runaway Protection" (2 replies)

Hi Guys,

I am experiencing a really strange issue. My printer is running Marlin 2.0.7.2 on a SKR 1.4 turbo. Since a few days a specifc print always stops at the exactly same position. The hotend temperature starts decreasing slowly without purpuse and the the printer stops due to "Thermal Runaway Protection".

Recv:11:33:15.985: T:245.31 /245.00 B:90.27 /90.00 @:86 B@:0
Recv:11:33:16.984: T:245.31 /245.00 B:90.20 /90.00 @:86 B@:0
Recv:11:33:17.985: T:245.31 /245.00 B:90.17 /90.00 @:101 B@:0
Recv:11:33:18.984: T:245.62 /245.00 B:90.10 /90.00 @:62 B@:0
Recv:11:33:19.985: T:245.31 /245.00 B:90.07 /90.00 @:104 B@:0
Recv:11:33:20.985: T:245.00 /245.00 B:89.97 /90.00 @:105 B@:33
Recv:11:33:21.985: T:244.69 /245.00 B:89.93 /90.00 @:114 B@:11
...
Recv:11:34:00.985: T:230.75 /245.00 B:89.76 /90.00 @:127 B@:56
Recv:11:34:01.986: T:230.50 /245.00 B:89.80 /90.00 @:127 B@:60
Recv:11:34:02.986: T:230.25 /245.00 B:89.86 /90.00 @:127 B@:58
Recv:11:34:03.986: T:230.25 /245.00 B:89.97 /90.00 @:127 B@:18
Recv:11:34:04.986: T:230.00 /245.00 B:90.03 /90.00 @:127 B@:16
Recv:11:34:05.885: Error:Thermal Runaway, system stopped! Heater_ID: 0

I have of course checked al cabeling and connectors - everything seems to be fine. I also cannot imagine that it is a cabeling issue because that would happen more randomly.

[attachment 117612 IMG_20210205_163039_small.jpg]
Two prints - same stuck at the same position. One was printet through Repetier Server, the other one through the printer display.

I also turned the part by 90 deg in the slicer and printed again - same result.

That really causes me some headake.

Does anyone have an idea how to further investigate or solve the issue?

Thanks,
Henning