If the hot end thermistor connection goes open circuit, usually no damage occurs but the temperature control goes out the window and your print will fail. Worse, they’re all moving around with the axis, and if failures occur at either end due to poor strain relief, or the conductors themselves break, then all manner of interesting failures can occur. You’ve got connections for powering the heater, fan power, four wires for the extruder motor, thermistor sensor wires. There are a lot of wires going to the extruder assembly, and with most designs this thing is flying around at quite some speed.
Had an interesting idea when looking at all the wiring of a typical 3D printer Use CAN Bus.
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