Klipper started throwing an error and shutting down while trying to heat the extruder. The extruder was cold, which basically meant a heater wire break. Thankfully it was very easy to find. So much for buying a nicer harness. Grumbles aside, I wonder if this wire got pinched when I assembled the chains, which lead to an early failure.
I didn't have any spare PTFE wire on hand, so I spliced in a length of 16 gauge silicone wire and made sure to land the solder and heat shrink sections well away from any possible motion. I have replacement wire on order, but am tempted to run as is until it fails again...
Disclaimer: I'm not a 3dprinter guy. I want to be, but I never found the time beyond a partially assembled prusa mendel i3.
....however, I have done an extensive amount of wiring, in various environments, a lot of it on moving parts, and what I can say is that wires of these gauges don't break like this just from movement along that cable chain (or whatever it's called), unless it's incredibly cold environment and/or incredibly cheap wiring.
I'm thinking that you're most likely correct in that it has been pinched.
Agree. The rest of the wire is pristine and you can see plenty of red insulation on one of the open links. In a non-electrical context I would call that self machining and call the red marks on the chain a witness mark. The printer is fully enclosed most of the time with bed fans to help warm the chamber up, so it's certainly not cold.