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UM2 Sensor doesn't fit in heaterblock

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Because of various problems, I requested a new heater block and head sensor for the block. There are two cilinders. The big one(heater) fits in easily, but the sensor doesn't fit at all. The screw is out of the block

Does anyone know how to solve this? I already tried heating the block, but it didn't help.

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It looks at your picture almost seems as if a part of the sensor already stuck in the hot end. Whatever seems to be the problem, it is obviously the right hot-end and also the correct sensor. Possibly the corresponding hole is not clean enough, drill cuttings could be stuck still inside.

Check the outer diameter of the sensor-jacket especially at the end region, and also check at other positions. If the sensor is really completely around? Or maybe he has a bump.

I'm not quite sure, but:

The correct diameter of the sensor should be just below 3mm, such as 2.85mm. The sensor hole should be 3 mm inner diameter.

You need a small round file and a flat file (nailfile).

But you can also use a small drill bit, but with finger force and without machine.

If the sensor is dented, then try the dent with the flat file to remove.

If the sensor is not dented, you have to make careful minimally larger the sensor hole at the hot end with the round file.

There are at low deviations, for example, also the possibility to heat the hot end with a separate controllable heat gun to 200-250 degrees, so that the metal expands slightly, and the sensor fits. If it should work, but then the subsequent removal of the sensor will be very difficult.


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