I am in the process of buttoning up a Nitehawk conversion on my Voron. I also replaced my extruder thermistor with an OE replacement purchased from a reputable vendor.

Post setup, my heated bed is reading spot on (it’s 18.3 C in my basement aka 65 F). I verified that my extruder is also at ambient temperature by wedging a Thermapen under its silicone sock and letting it acclimate for 10 minutes. The I’m not sure why the extruder would be reading high.

I bought a spare thermistor and wired it in. The result was identical.

Thoughts? Ideas? I’m pretty sure I have the Nitehawk and thermistor set up correctly.

[extruder] step_pin: nhk:gpio23 dir_pin: nhk:gpio24
enable_pin: !nhk:gpio25
heater_pin: nhk:gpio9
sensor_pin: nhk:gpio29
pullup_resistor: 2200
sensor_type: ATC Semitec 104NT-4-R025H42G`

  • IMALlama@lemmy.worldOPEnglish
    3·
    8 个月前

    Oh, that ` was me fighting with markdown to get the code portion of the post nicely formatted. I couldn’t figure out newlines and gave up.

    I don’t think heat is getting to the extruder via the NH. The thermistor is potted in a m3 bung that’s threaded into the extruder. The extruder itself is at ambient a few mm away.

    • Ediacarium@feddit.orgEnglish
      2·
      8 个月前

      This is what my temps look like after letting the printer cool back down again:

      It’s a LDO Voron2.4 kit with the stock Extruder and the nitehawk board. The chamber thermistor sits on top of the stealth burner side door.

      I dislike Discord as much as the next, but have you tried asking around if someone else has the same issue? Maybe you got unlucky and your nighthawk is defective.

      • IMALlama@lemmy.worldOPEnglish
        2·
        8 个月前

        Thanks for the point of reference. Any idea what extruder and thermistor you have?

        I measured my thermistor’s resistance when cold at 183 k ohms. This jives pretty well with the expected value per the data sheet. With the 2.2k ohm pullup resistor, this puts the A2D with 98.92 percent of Vref.

        I tested against a known hot source (165 °F) and the printer reported the correct value. The resistance at this value is a lot lower. I suspect the NH’s A2D is slightly non-linear at the extremes of its range, which is fairly normal.

          • IMALlama@lemmy.worldOPEnglish
            2·
            8 个月前

            Huh, thanks for the additional info. On the hot side the reported temperature seems to be spot on so I’m not going to worry about cold temps being off.