I too am an expert at pulling apart the hot end, I've also been quite frustrated with my printer at times, though I've not had issues to the extent of yours.
I'm mostly disappointed by the lack of consistency from one print to the next, and not having confidence to print anything taking more than a few hours for risk of failure.
"I've had multiple clogs in the Teflon fitting and nozzle, which could only be unclogged by taking everything apart. (I have become quite efficient at doing this)."
I'm sorry that you've been having so many problems; I know how frustrating it can be, because my own printer came with some issues when I first got it, and I it definitely takes the shine off the ownership experience. I'm glad you could get those things sorted out initially. Those initial quality control problems really should not have happened.
It looks like you've also gotten some great prints along the way, since then, so you know that it can do a lot better - but 'spending more time fixing problems than printing' is absolutely NOT the sign of the Ultimaker owner experience. It really should just work, and fwiw, my own experience has been that it does. So it's not a fundamental flaw in the printer; just something that isn't right about yours, still.
I think that between Ultimaker support, and the folks here, we can figure out what it is, and get it fixed... :-)
Firstly, regarding the firmware... the 14.1 firmware had another problem, so a few hours later, yet another update was put out, with a new version of the firmware. So, I'd be inclined to go download Cura yet again now, and install the firmware from that. Hopefully that will address all of the issues with aborting prints now.
All the other problems seem to be related to the temperature of the hot end. I think we've probably mentioned in other threads that the fan on the back of the print head needs to run all the time. That would definitely be something to keep an eye on; that it runs, and keeps running, and there isn't any sort of intermittent connection problem.
Other aspects of what you say - such as the head spitting out blobs of plastic sounds like the head may be getting much too hot. That could be a result of your print settings - what temp are you using? - but most likely its a some sort of temperature control issue. it might be an idea to go into the tune menu while printing, and see what sort of range the print head temperature experiences. Checking the wiring to the temperature sensor might be a good idea, also.
What other sorts of print failures are you experiencing?
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