1 Topic by mm2tts

  • mm2tts
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  • Registered: 2012-11-16
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Topic: Tried AutoTune Pid

I've tried auto tuning the pid for my hot end, but it doesn't seem to be doing anything useful after putting the numbers into the firmware via Repetier. My temps still fluctuate, especially at the beginnings of prints where it will swing up to 10 degrees either side of my set temp. I have a roll of white ABS that likes 180, but at the beginning of a print the temp can swing to just below 170 and stop extruding cause it's too cold. I thought auto tuning was supposed to keep the temps to within a couple of degrees?

2 Reply by rjp350z

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  • rjp350z
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  • From: Bloomfield, NJ
  • Registered: 2013-01-11
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Re: Tried AutoTune Pid

I ran Autotune on my extruder and if it fluctuates + a degree it's alot.  My temperature chart is a flat as can be when printing.

Are you sure you entered the last set of PID's that came up after it completed?

3 Reply by cmetzel

  • cmetzel
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  • From: Solidoodle2 #0091
  • Registered: 2012-08-22
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Re: Tried AutoTune Pid

Yeah the autotune gives multiple sets of numbers along the way.  Maybe you put in an early set?  Not to be a a*hole but you clicked write to eeprom or whatever it says on there too, right? 

After PID it shouldn't fluctuate like you're describing.

4 Reply by mm2tts

  • mm2tts
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Re: Tried AutoTune Pid

Yes to both. I set the auto tune for 5 cycles at 180 degrees and took the set of numbers right before the line that said the test was complete. Double checked the EPROM settings after putting the numbers in and saving them.