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Hi, Your post was from a while ago, so I hope the moderators don’t mind me reviving it and read the reasoning for allowing this further ahead. But first, a little background: I was skimming through a video that’s over two years old when I noticed a strange .cfg file. A quick Google search—bada bing, bada boom—and here I am. I have no idea what was available a year ago, but it looks like the conversation back then was centered on the XY-axis. The consensus was (and still is) to just get the backers and forget about it, which honestly sounds fair and true even today. For 2025, as of my reply, the discussion seems to be focused on the Z-axis specifically. With a little digging, I found posts, commits, and development around this exact topic as recently as last month. This means the topic is fresh and ongoing. The question is about the Z-axis, specifically where to place the thermistor. I have exactly the same question. Based on the goal (measure vertical extrusion temperatures) and checking the [Z_Thermal_Adjust], it looks like just one (1) NTK 50K thermistor is used. I'm guessing one that's anywhere between 19 - 39 " so you can comfortably route it as needed. As for the placement... Now, In terms of redundancy: "Two is one, and one is none". Therefore, I'm incline to place 8 thermistors. Two on each vertical extrusion, one inside the vertical extrusion channel to directly measure the extrusion temperature and the other facing inwards like an antenna. At a glance, this looks like a great place for such a configuration: Hot air expands, and rises; cooled air contracts – gets denser – and sinks. I say this, because I don't have advance software and I have not done any math... but I'm guessing that the sensors being this high is going to cause some issues in regards with timing (turning heaters / blowers off)? I'm so tired. I shouldn't be writing now and sharing this preliminary info - but hey it's FOSS / RepRap. Take all I've written so far with a grain of salt and very very early info. I'm not diving into the second half of the post for now. I want to see if this peaks anyone's interest and what the feedback is. Cheers!

That's the one that caught me on my VZ330 AWD build.

Monitor the fan noise ,if its gettng louder then replace ,your asking how long is a piece of string ? good fans will last ,cheap fans will not .