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Problems with fluctuating temperature on extruder 2

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Hi all!

I just received my UM3 Extended and I have performed some testprints. On extruder 1 (left) everything works just fine. I set it to 210 degrees and the printer pretty much holds that temperature. On extruder 2 I set the temperature to 180 and every now and then the temperature drops 10 degrees resulting in bad print. I've used a 5mm cylinder as a testprint and where those fluctuations in temperature occurs, there is a change in the diameter of the cylinder.

I've switched place of the two print cores but the problem remains on extruder 2 (right)

I've attached the temperature chart and a picture of the print so you can see how the temperature change affects the print.

Any suggestions?

screenshot.thumb.JPG.47a39c3054b72d91d414dc8a4b80fd0b.JPG

print.thumb.jpg.3610ee2a5f402883c9e48b907bc89d90.jpg

screenshot.thumb.JPG.47a39c3054b72d91d414dc8a4b80fd0b.JPG

print.thumb.jpg.3610ee2a5f402883c9e48b907bc89d90.jpg

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You should contact your reseller.  I think some wire is loose in the head maybe or the connection is too high or too low and not making good contact with the temp sensor.

The answer I got from the reseller was pretty much what you said, that in some cases there has been a connection problem between the main circuit board and the head. They advised me to test to make sure the connector in the head was inserted properly. I will test this later this evening and report back.

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Minutes ago someone just told me you should push the wires further down into the head and then to also put some tape around them so there is a tighter fit and they don't slide up again.

Having only tried a small print of about 20 minutes everything looks ok now! I've just started a longer 4 hour print now so that will be the final test. But so far so good!

I will add some tape to ensure the connector doesn't give me any more headache! Thanks for your help!!

screenshot2.thumb.JPG.f0d0c75140c923af63f4bbb67ac6ef6b.JPG

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