Print this one if you can https://www.youmagine.com/designs/alternative-um2-feeder-version-two
Its the most widely used and is very good. It also make it faster to change materials and easier to clean the knurled knob.
If you are unable to print it, then I'm sure someone near you could.
Not good that you are having these issues but as hal-9000 said. once you are passed them im sure you will love it.
I had a few issues to start with but I stuck with it and I'm really glad i did.
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hal-9000 0
Let me first say that even though you have experienced issues with the printer and it looks daunting now, you're bound to experience these or a multitude of other problems with other brands too. The device is solid and I believe you'll be happy once you get over this hump.
Now about your issue, from reading it seems like the issue outstanding is the Bowden tube and feeder, is that right? I can speak to issues with the U1 where I have had this problem if there is a slight build up on the knurled bolt or if the mechanism is too tight.
You may also want to look at printing a replacement ring for under your Bowden clip as maybe your not in alignment (goes under the white plug where the tube enters). Have you also tried maybe re-seating the tube itself? I am thinking since you took it apart to fix the temp sensor and all it may not be all the way seated or seated incorrectly.
Even before that I would email support and replace the cracked pieces so you can start clean.
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