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Thermometers reading different temperatures on cold printer? (lemmy.world)

submitted 2 weeks ago by IMALlama to c/3dprinting

14 comments fedilink hide all child comments

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`

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[–] IMALlama 2 points 2 weeks ago (1 children)

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.

[–] [email protected] 2 points 2 weeks ago (1 children)

I'm using the E3D Revo Voron hotside and coldside.

Since I'm using E3Ds all-in-one heatercore package, I don't know for certain. But from this page: https://e3d-online.com/products/revo-heatercore it seems to be a 104-NT thermistor.

It's set up as an "ATC Semitec 104NT-4-R025H42G", same as yours.

[–] IMALlama 2 points 2 weeks ago

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.