Bed temperature mismatch

Hi all,

On the weekend I successfully got my Mendel printing (see my blog if you're interested).

I did however note that I was struggling to get the bed to reach 110C.

I bought a multimeter which does temperature readings and noted that the bed was much higher than Pronterface (or the Sprinter firmware) was declaring. I am using an EPCOS 100k thermistor supplied by Think3DPrint3D and chose that (6) in the Sprinter firmware (I have the latest version committed by Kliment 8 days ago - 7d45ae9ecf) config.

Any suggestions would be appreciated.

Thanks,
Craig

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[blogger.kritzinger.net]

Hi Craig

Sorry to hear about the thermistor issue, you are using the correct thermistor table if its set to 6 in firmware. Its worth while checking the resistance of the entire thermistor setup including the crimp terminals to see if you are close to 100K at room temperature. If not then i could be the connections or the thermistor. let us know how you get on and we will post another thermistor if this one is wrong.

Tony
T3P3

For closure I thought I would point out that I am pretty sure the discrepancies are due to either having the incorrect thermistor table loaded, or that the variance in the thermistors I have tried are at the extreme of the design tolerance.

Either way, I have remedied the problem by creating my own thermistor tables as documented in my blog.