[09] echo: highest temp: 407
This line scares me.
It's not actually hitting that, right Joel?
[09] echo: highest temp: 407
This line scares me.
It's not actually hitting that, right Joel?
Thanks Owen, yes that M301 lline looks fine to use.
Dave, that's the raw value and not the temps (so 414 is actually 202.15C). Yeah I should really change those outputs to say raw temp or something
Thanks Owen, yes that M301 lline looks fine to use.
Thanks Joel
Is it exactlty that now or 10X that?
Thanks Owen, yes that M301 lline looks fine to use.
Thanks Joel
Is it exactlty that now or 10X that?
Whoops sorry, forgot to mention. Use those values as is. I've added code in the firmware to just scale it up by 10 for the moment.
I put in the values and did some calibration prints at 183. They went very good though I had to turn the extruder RPM up a bit
When I printed at 183 it stopped extruding part way through on the down skins
I went back to 193, which had been oozing out extra material in patches on the down skins (I thought possibly by going over temp but not sure)
It printed very well onto top of the layers I already had there from the failure at 183.
No big patches of blobbing.
So it's possible it may have stopped the temp from overshooting.
Not too sure yet as I don't measure temp once I start printing.
I will be printing another copy of the same thing tomorrow from scratch (No layers already underneath)
As this has consistently been giving some blobbing lately on the down skins, more so with the Blue PLA, I will see if it's better or not and let you know.
Short story is so far so good.
Thanks for your efforts Joel.
Owen
Thanks for the update Owen.
Yeah, the values need a little bit of tweaking to work for prints. It's more likely to undershoot than overshoot... I still haven't figured out how to mathematically tweak the values to cause it overshoot slightly while remaining stable.
You can modify the "C" extrusion speed bias (I think in Bernhard's branch, you need to modify and upload the firmware to change it). WIth my PID tuning firmware, M301 C0.17 will set the C bias (0.17 worked for me, but your mileage may vary). The higher it is, the harder it'll drive the heater based on your extruder speed.
Having said that, my fork's temps might behave a little differently. I added an error bias (seems to help) and a filtering factor (I can't tell if this makes a difference).
I tried PID tuning on my Mendel today. It's a Prusa Mendel with Ramps1.4 and a 100k NTC-based hotend (reprap-fab). After hacking in the pin configuration for the Ramps and setting the Thermistor, i started the tuning process. My workshop is pretty cold atm, and i regularly run into MINTEMP at the start of a print, so i didn't think much about the initial "some value is too high" error, which went away after heating up the hotend a bit.
So when the tuning started, the hotend did heat up, but it reported the maximum raw temperature as 988, and the current temperature was dropping - I guess the tuning process ignores any thermistor/thermocouple setup made and just looks at the raw values. However, for an NTC this doesn't work. At all.
I guess i'll have to set up PID the hard way then.
-Tom
I think this is what you want
SENDING:M302 S190
echo: Auto tuning PID values...
echo: Please keep watch over your printer and be ready to shut it down if it acts strangely.
echo: Discovering what controller output is required to reach 190C
.
.
.
echo: Highest temp: 275
echo: Temperature stabilised at: 134.28 (CO: 55)
.
.
.
echo: Highest temp: 312
echo: Temperature stabilised at: 151.86 (CO: 65)
.
.
.
echo: Highest temp: 347
echo: Temperature stabilised at: 169.43 (CO: 75)
.
.
.
echo: Highest temp: 381
echo: Temperature stabilised at: 186.04 (CO: 85)
.
.
.
echo: Highest temp: 416
echo: Temperature stabilised at: 202.64 (CO: 95)
echo: Attempting to establish ambient temperature
.
.
.
echo: Lowest temp: 66
echo: Room temperature: 32.23C, raw: 66
echo: Determining base tuning constants.
echo: Heating printer. Heater pin set to 95
echo: Process dead time: 16.00s
echo: startMillis: 4359966
.
.
.
echo: Highest temp: 412
echo: Final temperature: 201.17
echo: 63% PV: 259.56
echo: PV: 412 5301439ms
.
.
.
echo: PV: 255 4540238ms
echo: Process time: 4547.25s
echo: echo: Process gain: 3.00 (deltaPV: 346)
echo: Computed values:
echo: Kp: 3.000000000
echo: Tc: 4547.253417968
echo: Ti: 4555.253417968
echo: Td: 7.985950469
echo: Calculated P:332.748962402 ,I: 0.073047294, D:2657.316650390 A:998.25
echo:
echo: WARNING! PID settings were merely computed. To use them, please enter the following command:
echo: M301 P332.748962402 I0.073047294 D2657.316650390 A998.246826171
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owen 19
This is my most recent results Joel
[08] Machine stop called.
[08] Building...
[08] Estimating build time...
[08] Estimated build time is:
[08] Beginning build.
[08] echo: auto tuning pid values...
[08] echo: please keep watch over your printer and be ready to shut it down if it acts strangely.
[08] echo: discovering what controller output is required to reach 193c
[08] Yes, I have a Realtime Control feature.
[08] Supports RC
[08] echo: highest temp: 63
[08] echo: highest temp: 63
[08] Yes, I have a Realtime Control feature.
[08] Supports RC
[08] Done building.
[08] echo: highest temp: 63
[09] echo: highest temp: 407
.
.
.
[09] echo: highest temp: 414
[09] echo: temperature stabilised at: 202.15 (co: 105)
[09] echo: attempting to establish ambient temperature
.
.
.
[09] echo: highest temp: 396
[09] echo: final temperature: 193.36
[09] echo: 63% pv: 249.48
[09] echo: pv: 396 5468677ms
.
.
.
[09] echo: pv: 248 4867730ms
[09] echo: process time: 4869.70s
[09] echo: echo: process gain: 3.00 (deltapv: 332)
[09] echo: computed values:
[09] echo: kp: 3.000000000
[09] echo: tc: 4869.703613281
[09] echo: ti: 4874.203613281
[09] echo: td: 4.495845317
[09] echo: calculated p:333.025878906 ,i: 0.068324155, d:1497.232788085 a:999.08
[09] echo:
[09] echo: warning! pid settings were merely computed. to use them, please enter the following command:
[09] echo: m301 p333.025878906 i0.068324155 d1497.232788085 a999.077636718
Does that M301 right to enter?
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