I've checked to see if it was a heat sensor problem, either then going above the set temperature with 4-5 degrees when I preheat it doesn't do more that fluctuate 1 degree above or under the set temperature at the beggining of the print.
I'll be keeping an eye out for the temperature from now on and see if this changes.
What we've done after the temperature check was to clean out the nozzle with a drill. It's been printing well for four hours now...fingers crossed...I have a 17 hour print awaiting
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jonnybischof 60
I've had similar problems. There was random failure and nozzle clogging, starting relatively small but then reaching a point where I couldn't print anything at all anymore. At first I didn't find any cause, everything seemed fine.
In my case, the culprit was the nozzle temperature sensor's wiring (along the bowden), which was broken (slack joint).
If you have an Ulticontroller: observe your temperature readings (for at least 10 minutes continuously). If the nozzle temperature jumps from let's say 200°C to 205°C suddenly (anything more than 3°C at a time, after the heating-up period of course), then you probably have exactly that problem. The nozzle temperature shouldn't jump several degrees during normal operation, so if you actually see that, then you do most likely have that problem.
If you don't see any suden jumps in temperature reading - then ignore all the rest I'm going to write
If the connection to the temp sensor is broken mid-print, then the reading will just remain at the last read value - resulting in uncontrolled heating or cooling down of the nozzle. At some point, the slack joint does make connection again and the actual temperature is read -> jumping from one value to another suddenly.
(This can be "simulated" by actually disconnecting the temp sensor wire on the UM electronics during mid-print)
The effects can be randomly clogged nozzles, overheated material inside the nozzle, smoking nozzle up to the point where the printhead actually melts down.
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