Yes, the thermocouple seems to have come out from its metal sleeve. I see the rim of the metal sleeve in the block, but that one doesn't come out - at least not without using some amount of force.
I now switched on my printer to check the temperature the TC reports - it looks quite normal, although a bit low. When I keep the tip of the TC inside my palm, I get 28-29C - while a body thermometer shows around 32C. Well, I understand the UM TC is probably calibrated for temperatures much higher than that.
The printing head looks pretty normal.
Do you know if the TC is some standard component which could be ordered from different sources - or is it something UM-specific? Maybe the metal sleeve is tailored for UM2 or something...
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illuminarti 18
The thermocouple is supposed to be in a metal sleeve that fits into the block. Did it come out of that? I presume that the thermocouple is failing somehow, and reporting incorrectly? What temperature does it report?
You probably need a new thermocouple, at the very least. How does the rest of the head seem?
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