Fighting with computers

I have been working on a couple of research projects lately involving the creation of a concrete 3D printer and a large-format plastic 3D printer using a pellet extruder. Both printers have in common that their electronics are built around Duet 3 controller boards, as they give you great flexibility.  That flexibility comes at a cost, as I must learn to configure the required features. Most of the time, I can find the info I need in their manuals or user forums. Occasionally, I ask a question there, too, and I always have a useful and quick answer.  My latest challenge was to get working a four heated sections hotend. I was using a Duet 3 6HC board on that machine that features four thermistor inputs, but given that a heated bed was already using one, I was missing one thermistor input. Eventually, I had to buy a 1HCL extension board that added one motor controller and two additional thermistor inputs to the base system it connects to with a CAN bus.  I thought I could use an old tele