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Thanks for the photos Balto, they really help. I'm very sorry to hear about the situation the knob caused. I will definitely do what I can to fix the problems with the knob.
From the pictures, I can see two problems. First, it looks like the threaded section actually separated from the rest of the knob. This is what caused your knob to be so loose. The good news is this probably isn't heat related (which is good because I can't fix that part). I should be able to print the part at a higher density which will make it stronger so this does not happen again. The second issue of the wire being sheared/cut is a separate issue. I would imagine the knob rotated and eventually cut through the wire. Does this sound right? The busted threads may have added to this. The knob on my car has rotated as well, mostly when real warm. I haven't had it even start to cut into my wire yet, though I have checked. I haven't implemented the fix for it yet, but I am going to try using some blue loctite (which should make the knob still be removable) next time I reinstall it. This should prevent it from turning.
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