So 10 hours into a 12 hour print and my printer said dec where

3D Printing
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So 10 hours into a 12 hour print and my printer said dec where the hot end temp goes… Decoupled? If so how do I fix it? It stops the print but the temp is still reported to repetier server. It is a davinci 1.0 flashed with repetier. The filament sensor and the thermocouple I guess have been acting up. Here is a graph of extruder temps… It has been dropping to 0 randomly and bouncing back up. All the wires seem fine

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66852f714e2b917a030fb35dd9e304bc.png640×1136 81.4 KB

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You have a bad thermistor or a loose connection to those

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The temp was still being reported to repetier server when it said decoupled

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Yes it has an it will until decoupled.

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I believe it was a loose heater wire because the graph that I didn’t post the temp was dropping and then it popped up with an error. The heater wire has been pulled many times. Time for a new connection

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That’s what I meant. Loose connection. It happened to me far to many times to forget

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@Abc_Def Being metal wire used for the heater wire – it could be possible that you are suffering from a physics issue (thermal expansion).
Constantly heating metal can cause the metal to expand, if that metal cools very quickly (contraction) – it could cause the wire to be loosened from its connection.

Recommendation:
Secure the end of the wire with high-heat resistant adhesive. You could also apply sometime of electrical grease/paste the end of the wire to help mitigate the issues with Thermal expansion.
Maybe even use some kind of heat-sink on the wire’s end to relieve some of the stress on the wire.

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I’m probably gonna change the connectors

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I believe that the temp dropping to 0 isn’t the problem because it has done that since the start. I believe it is the heater wires because it will cool down or won’t heat up and then dec appears. Time to buy some connectors

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Is eather, just check all conections

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@Abc_Def Heating up and/or cooling down then getting decoupling errors – still sounds like some form of thermal expansion to me and the wires are working themselves loose due to this constant warm-up and cool-down cycle.

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@William_L_DeRieux_IV the heater wires have gotten pulled and caught MANY times since installed so I believe that’s what caused the bad connection. I have new connectors soldered on now and everything is good so far